ChemistryQB Topic3a MC e

(Questions marked with () belong to the revised edition

Question Bank Topic 3MetalsName: ___________________________ Class: ____________ Class No: __________Mark: ___________Date:______________

Multiple choice questionsUnit 99.1:Metals in our lives9.2:Uses of metals and their properties9.3: Metals in the Earths crust(CDC guide: Occurrence of metals in nature and their uses in daily life)

1The most abundant metal in the Earths crust is

Airon.

Baluminium.

Cmercury.

Dcopper.

2Which of the following metals is used in making jewellery?

AGold

BTin

CAluminium

DLead3Which of the following metals is used to make overhead power cables?

ACopper

BIron

CAluminium

DZinc4Which of the following combinations concerning the use of metal is correct?

Metal

Use

ACopper Electrical wires

BIron Cooking foil

CLead Food cans

DMagnesiumWater pipes5Which of the following combinations concerning the use of metal is INCORRECT?

Metal

Use

AAluminium Window frames

BSilver Jewellery

CMagnesium Railings

DTungsten Light bulb filaments6Which of the following objects is least likely to contain titanium?

AJoint replacement part

BSpectacles

CWatch case

DWater tap7Which of the following combinations concerning the use of metal is correct?

Metal

Use

ALithium

Making dry cells

BCopper

Making fuses in electric plugs

CTitanium

Making light bulb filaments

DZinc

Making cans for canned foods8Which of the following metals are suitable for making cooking utensils?

(1)Aluminium

(2)Copper

(3)Lead

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)9Brass, an alloy of copper and zinc, is commonly used for making ornaments because

(1)it has an attractive appearance.

(2)it can resist corrosion.

(3)its melting point is lower than copper.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)10Titanium is used in making supersonic aircraft bodies. Which of the following are reasons of using titanium for making aircraft bodies?

(1)It is light but strong.

(2)It is cheap.

(3)It is very corrosion resistant.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)11Common uses of aluminium include

(1)making window frames.

(2)making soft drink cans.

(3)making electronic components.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)12Which of the following statements concerning iron are correct?

(1)It is the second most abundant metal in the Earths crust.

(2)It can be used to make drain covers.

(3)It is corrosion resistant.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)13Aluminium is used to make cooking foil because

(1)it is very malleable.

(2)it resists corrosion.

(3)it is a good conductor of heat.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)14Copper is NOT suitable for making overhead cables because

(1)its density is high.

(2)its price is high.

(3)its electrical conductivity is low.

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only9.4:Occurrence of metals in nature and their extraction methods(CDC guide: Obtaining metals by heating metal oxides or by heating metal oxides with carbon & Extraction of metals by electrolysis)

1The main ore of iron is

Abauxite.

Bcarnallite.

Ccinnabar.

Dhaematite.2Which ore contains aluminium?

ABauxite

BCarnallite

CHaematite

DGalena3Which of the following methods is most suitable for extracting sodium from sodium chloride?AHeating sodium chloride with carbon

BHeating sodium chloride in air

CElectrolysis of molten sodium chloride

DElectrolysis of sodium chloride solution4Aluminium is commonly extracted by electrolysis of its molten

Acarbonate.

Bsulphate.

Coxide.

Dsulphide.5Which of the following metals can be extracted from its oxide by heating in air?

ALead

BMercury

CZinc

DIron6Which of the following metal oxides CANNOT be reduced to form metal when heated with carbon?

ACopper(II) oxide

BIron(III) oxide

CZinc oxide

DMagnesium oxide7Which of the following methods can be used to extract iron from iron(III) oxide?

AHeating iron(III) oxide in air

BHeating iron(III) oxide with carbon at about 600 oC

CHeating iron(III) oxide with carbon at about 1000 oC

DMixing iron(III) oxide with carbon monoxide at room temperature8Which of the following compounds does NOT undergo a chemical change upon heating?

AIron(II) sulphide

BMercury(II) sulphide

CSilver oxide

DSodium oxide9Carbon is used as a reducing agent in the extraction of iron from its ore because

Acarbon is cheap.

Bcarbon is a non-metal while iron is a metal.

Ccarbon is a good conductor of electricity.

Dpure carbon can be obtained readily.10Which of the following groups of metals are extracted by electrolysis?

AK, Mg and Zn

BNa, Ca and Al

CAl, Ca and Fe

DFe, Ag and Cu11A small amount of silver oxide is heated in a boiling tube. Which of the following graphs represents the correct plot?

Directions: Questions 12 and 13 refer to the following electrolytic cell used to obtain aluminium metal from aluminium oxide.

12From which element are the electrodes made?

AGraphite

BIron

CSulphur

DZinc

13The positive electrodes are replaced frequently because they react with

Aaluminium.

Baluminium oxide.

Ccryolite.

Doxygen.14 The diagram shows a method for changing a metal oxide into a metal.

Which oxide below can be changed into a metal by this method?

ACalcium oxide

BCopper(II) oxide

CMagnesium oxide

DPotassium oxideDirections: Questions 15 and 16 refer to the diagram which shows substances used in a blast furnace to produce iron.

15What is substance X?

AChromium

BCoke

CCalcium oxide

DSulphur16Which of the following substances would react with the iron(III) oxide in the furnace to

produce iron?

ACarbon dioxide

BCarbon monoxide

CHot air

DOxygen17Which of the following metals can be found free in nature?

(1)Lead

(2)Gold

(3)Silver

(4)Mercury

A(2) and (3) only

B(1), (2) and (3) only

C(1), (2) and (4) only

D(1), (3) and (4) only18Which of the following metals can be extracted from their oxides by heating with coke?

(1)Calcium

(2)Iron

(3)Lead

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)19Which of the following metal oxides can be reduced when heated with carbon at 600 oC?

(1)Lead(II) oxide

(2)Copper(II) oxide

(3)Zinc oxide

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)20Which of the following statements are correct?

(1)Extraction of metals by electrolysis is more expensive than by reduction with carbon.

(2)When lead(II) sulphide is heated in air, lead(II) oxide and sulphur dioxide will be

obtained.

(3)Carbon monoxide can be used to reduce iron(III) oxide.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)21In which of the following processes would a metal be produced?

(1)Heating mercury(II) sulphide in air.

(2)Heating magnesite with carbon.

(3)Controlled heating of copper pyrite in air.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)22In which of the following experiments would a gas be produced?

(1)Reacting iron(III) oxide with carbon monoxide

(2)Heating limestone strongly

(3)Heating lead(II) sulphide in air

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)9.5:Discovery of metals and the ease of extraction(CDC guide: Relation of the discovery of metals with the ease of extraction of metals and the availability of raw materials)

1 Three metals, X, Y and Z were discovered in A.D.1807, B.C. 3500 and A.D. 1746 respectively. The order of increasing ease of extraction is probably

AX, Y, Z.

BX, Z, Y.

CY, X, Z.

DY, Z, X.2Ancient people discovered copper, but not aluminium because aluminium

Ais very rare.

Bis difficult to extract.

Cis light.

Dis found very deep in the Earths crust.3The year of discovery of a metal is closely related to

(1)the ease of extraction from its ore.

(2)the thermal stability of its ore.

(3)its melting point.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)4The price of a metal depends mainly on

(1)its abundance in the Earth's crust.

(2)the extraction method used.

(3)the mining cost of its ore.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)5Which of the following statements concerning aluminium is / are correct?

(1)Aluminium was used earlier than iron in the history of mankind.

(2)Aluminium is more abundant than iron in the Earths crust.

(3)Aluminium can be extracted by electrolysis of its oxide.

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only9.6:How long will metal resources last?

9.7: Conservation of metal resources

(CDC guide: Limited reserve of metals and their conservations)

1Which of the following statements is correct?

AAluminium is the only metal that is recycled to a large extent.

BThe resources of iron will last for about 1000 years.

CRecycling helps reduce the waste disposal problems.

DIt is economical to recycle metals because the cost of extraction is higher than the cost of recycling.2Which of the following materials is frequently used to replace metals for making water pipes?AGlass

BPlastic

CWood

DPaper3Which of the following statements concerning the recycling of metals is INCORRECT?

ARecycling of used metals consumes less energy than extracting metals from their ores.

BIt is difficult to sort out metals from household waste for recycling.

CAll products made by recycled metals have bad quality.

DRecycling is important because resources of metals are limited.4Which of the following are possible ways to conserve metals?

(1)Recycle used metals

(2)Reduce the use of metals

(3)Reuse metal articles

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)5Which of the following methods will help to conserve aluminium?

(1)Recycle used aluminium foils

(2)Replace aluminium cans with glass bottles

(3) Reuse aluminium articles

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)6Which of the following statements concerning the recycling of metals are correct?

(1)It is a method of conserving metal resources.

(2)It helps to reduce pollution.

(3)It can raise public awareness of conservation.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)Unit 1010.1: Comparing the reactivity of metals10.2: How do metals react with oxygen?10.3: How do metals react with water or steam?10.4: How do metals react with dilute acids?

(CDC guide: Reactions of metals with oxygen, water and dilute acid)

1Which of the following metals burns with a brick-red flame?

APotassium

BSodium

CCalcium

DMagnesium2The oxide of a metal is orange when it is hot but yellow when it is cold. The metal is

Apotassium.

Bzinc.

Ccalcium.

Dlead.3Which of the following metals does NOT give any observable changes upon heating?

APlatinum

BIron

CMercury

DCalcium4Sodium should be stored

Ain a brown bottle.

Bin an air-tight flask.

Cin paraffin oil

Din water.5Which of the following metals can burn spontaneously in water to give a purple flame?

APotassium

BSodium

CCalcium

DMagnesium6Hydrogen can be prepared by using the following set-up:

Which metal is most suitable for this purpose?

APotassium

BCalcium

CMagnesium

DLead7Consider the following experiment:

During the experiment, a gas is liberated. The gas can burn at the end of the delivery tube. X is

probably

Azinc. Bsilver.

Clead.

D copper.8Which of the following metals is most suitable for making a container to hold hot water?

AAluminium

BCopper

CMagnesium

DSilver9Which of the following word equations is correct?

ASodium + water ( sodium oxide + hydrogen

BIron + water ( iron(II) hydroxide + hydrogen

CMagnesium + steam ( magnesium oxide + hydrogen

DLead + steam ( lead(II) hydroxide + hydrogen10Hydrogen can be prepared in the laboratory by reacting dilute sulphuric acid with

Asodium.

Bzinc.

Clead.

Dcopper.11Which of the following pairs of chemicals do NOT give hydrogen when reacted?

AMagnesium and dilute sulphuric acid

BCalcium and water

CIron and steam

DSilver and dilute hydrochloric acid12Metal X does NOT react with cold water but reacts readily with steam. Metal X is probably

Acalcium.

Bcopper.

Clead.

Dmagnesium.13Results of some experiments on a metal X are shown below:

( X burns when heated in air.

( X reacts with water to give a hydroxide.

( X cannot be extracted from its oxide by carbon reduction.

X could be

Aaluminium.

Biron.

Cmagnesium.

Dpotassium.14In an experiment, dilute hydrochloric acid was added to a test tube containing several small pieces of zinc.

Which of the following observations could have been made during this experiment?

AThere was no observable change.

BA thick white precipitate formed.

CA colourless gas was produced and the test tube cooled off.

DA colourless gas was produced and the test tube warmed up.15Which of the following pairs of substances would NOT react together?

ACalcium and dilute hydrochloric acid

BCalcium carbonate and dilute nitric acid

CCopper and dilute sulphuric acid

DCopper(II) carbonate and dilute hydrochloric acid16Barium (Ba) is a Group II element of the periodic table. Its relative atomic mass is greater than that of calcium. Which of the following statements concerning barium is INCORRECT?

ABarium reacts vigorously with water.

BBarium reacts with water to give barium oxide.

CBarium sinks in water.

DThe melting point of barium is lower than that of calcium.17 X is an element. It forms a cation X2+ with an electronic arrangement of 2, 8, 8. Which of the following statements concerning X is correct?

AX gives a purple flame when burned in air.

BX sinks in water.

CX can be extracted from its ore by carbon reduction.

DThe reaction between X and dilute sulphuric acid can be used to prepare hydrogen.18In which of the following cases will a reaction take place?

(1)Adding zinc into cold water

(2)Adding iron into dilute sulphuric acid

(3)Heating copper(II) oxide with carbon

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only19Which of the following metals would form an oxide with different colours at different

temperatures?

(1)Iron

(2)Lead

(3) Zinc

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)20Which of the following metals do(es) NOT burn on heating?

(1) Calcium

(2) Lead

(3)Mercury

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only21Which of the following metals are shiny when freshly cut but rapidly tarnishes in air?

(1)Potassium

(2)Sodium

(3)Zinc

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)22Which of the following statements concerning sodium are correct?

(1)Sodium can be cut by a knife.

(2)Sodium tarnishes rapidly in air.

(3)Sodium burns with a golden yellow flame.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)23Which of the following metals can react with cold water readily to give hydrogen?

(1)Calcium

(2)Magnesium

(3)Zinc

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only24Which of the following metals do(es) NOT react with water but react(s) with steam?

(1)Iron

(2)Lead

(3)Mercury

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only25A piece of magnesium ribbon is placed in a test tube containing dilute hydrochloric acid. Which of the following statements are correct?

(1)Magnesium dissolves to give a colourless solution.

(2)A pop sound results when a glowing splint is placed near to the mouth of the test tube.

(3)The resulting solution is magnesium chloride solution.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)26Which of the following actions is dangerous and should NOT be attempted in the school

laboratory?

(1)Adding sodium to dilute sulphuric acid

(2)Disposing a piece of potassium to a rubbish bin

(3)Heating calcium in steam

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)27Which of the following pairs of substances can react with each other?

(1)Aluminium and steam

(2)Magnesium and dilute sulphuric acid

(3)Lead and hot water

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)28Cold and dilute sulphuric acid has NO observable reaction with

(1)calcium.

(2)lead.

(3)copper.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)29When a small piece of sodium is put into a trough of water, a reaction occurs. Which of the following statements concerning this reaction is / are correct?

(1)An explosion occurs.

(2)Heat is given out.

(3)An alkaline solution is formed.

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only30In which of the following experiments would hydrogen be produced?

(1)Electrolysis of sea water

(2)Passing steam over magnesium

(3)Adding iron to dilute hydrochloric acid

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)31A counterfeit gold coin is made from an alloy of copper and zinc. Which of the following methods can be used to distinguish the counterfeit coin from a gold coin?

(1)Comparing their densities

(2)Treating both coins with dilute hydrochloric acid

(3)Comparing their electrical conductivity

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)10.5: The reactivity series10.8: What determines the reactivity of a metal?

(CDC guide: Metal reactivity series and the tendency of metal to form positive ion)

1Which of the following shows the correct descending order of reactivity of metals?

AFe, Zn, Ag, Cu

BAl, Fe, Cu, Au

CK, Na, Al, Ca

DMg, Al, Pb, Zn2Potassium is more reactive than calcium because

Apotassium loses electrons more readily than calcium does.

Bpotassium has a lower melting point than calcium.

Cpotassium has a lower density than calcium.

Dcalcium ions are more stable than potassium ions.3Which of the following combinations is correct? The ease of losing electrons of metals

The reactivity of metalsA

Increases across a period

Decreases down a groupB

Decreases across a period

Increases down a groupC

Increases across a period

Increases down a groupD

Decreases across a period

Decreases down a group4Which of the following statements are correct?

(1)Metals react by losing electrons.

(2)Metals react by forming cations.

(3)The more reactive the metal is, the more readily it loses electrons.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)5Which of the following properties are related to the metal reactivity series?

(1)The ease of extraction of a metal

(2)The method of storing a metal

(3)The stability of the compounds of a metal

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)6Rubidium is a Group I element below potassium in the periodic table. Which of the following statements concerning rubidium are correct?

(1)Rubidium loses electrons more readily than potassium does.

(2)Rubidium reacts with water to give rubidium hydroxide and hydrogen.

(3)Rubidium can be extracted from its oxide by reduction with carbon.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)10.6: What is a chemical equation?10.7: How to write balanced chemical equations?10:10: Ionic equations(CDC guide: Chemical equations and ionic equations)

1Which of the following combinations of state symbols is correct for this reaction?

2Na + 2H2O ( 2NaOH + H2

A(s), (l), (aq), (g)

B(s), (aq), (s), (g)

C(l), (aq), (s), (l)

D(l), (l), (aq), (l)2In limestone areas, calcium carbonate in the rock reacts with rainwater containing dissolved carbon dioxide as shown by the following equation:

CaCO3(x) + CO2(g) + H2O(y) ( Ca(HCO3)2(z)

Which of the following combinations is correct?

xyz

Aaqls

Baqaqs

Csaqaq

Dslaq3Solid sodium hydrogencarbonate decomposes upon heating according to the following equation: heat

2NaHCO3(s) ( Na2CO3(x) + CO2(y) + H2O(z)


xyz

Aaqgaq

Baqaql

Csgl

Dsaqaq4Iron can be produced from iron(III) oxide by the following reaction:

heat

Fe2O3(x) + 3CO(y) ( 2Fe(s) + 3CO2(z)


xyz

Asaqaq

Bsgg

Caqaqaq

Daqgg5Consider the following reaction:

CaCO3(x) + 2HCl(y) (CaCl2(aq) + CO2(g) + H2O(z)


xyz

Aaqlaq

Baqaql

Csaql

Dslaq6Consider the following chemical equation:

2HNO3(aq) + Na2CO3(x) ( 2NaNO3(y) + H2O(z) + CO2(g)


xyz

Aaqsl

Baqaqaq

Csaql

Dssaq7Consider the following chemical equation: heat

4Fe(OH)2(x) + O2(g) ( 2Fe2O3(y) + 4H2O(z)


xyz

Assl

Bsaqaq

Caqsaq

Daqaql8The reaction between magnesium hydrogencarbonate solution and zinc sulphate solution can be represented by the following equation:

Mg(HCO3)2(aq) + ZnSO4(aq) ( MgSO4(x) + ZnCO3(y) + H2O(z) + CO2(g)


xyz

Aaqsaq

Bsaqaq

Caqsl

Dsaql

9 Consider the following chemical equation:

Na2S2O3(aq) + 2HCl(aq) ( 2NaCl(x) + SO2(aq) + H2O(y) + S(z)


xyz

Alaqs

Blaqaq

Caqlaq

Daqls10 When sodium hypochlorite solution is exposed to sunlight, it decomposes according to the following equation:

xNaOCl(aq) ( yNaCl(aq) + zO2(g)


xyz

A211

B221

C121

D21211The reaction between hydrogen iodide and concentrated sulphuric acid can be represented by the following equation:

xHI(aq) + H2SO4(l) ( H2S(g) + yH2O(l) + zI2(aq) What is the value of x?

A4

B6

C8

D1012One way to dissolve gold (Au) is to react it with Aqua-regia, a mixture of concentrated nitric acid and concentrated hydrochloric acid. The equation for the reaction is:

Au(s) + xHNO3(aq) + yHCl(aq) HAuCl4(aq) + zH2O(l) + zNO2(g)

What is the value of z?

A2

B3

C4

D513The following equation represents the reaction between an oxide of lead and hydrogen:

heat Pb3O4(s) + xH2(g) ( yPb(s) + zH2O(l)


xyz

A232

B423

C434

D24314Magnesium nitride is decomposed by water according to the following equation:

Mg3N2(s) + xH2O(l) ( yMg(OH)2(s) + zNH3(g)


xyz

A632

B623

C362

D32615Consider the following chemical equation:

xH2S(g) + 2KMnO4(aq) + yH2SO4(aq) ( xS(s) + zH2O(l) + 2MnSO4(aq) + K2SO4(aq)Which of the following combinations is correct?

xyz

A853

B835

C538

D58316 Consider the following chemical equation:

2HNO3(aq) + xFeSO4(aq) + yH2SO4(aq) ( zFe2(SO4)3(aq) + 4H2O(l) + 2NO(g)


xyz

A211

B432

C623

D63317The action of dilute nitric acid on copper can be represented by the following equation:xCu(s) + yHNO3(aq) ( xCu(NO3)2(aq) + 4H2O(l) + zNO(g)

The values of x, y and z in the balanced equation should be

A3, 4 and 1.

B3, 8 and 2.

C4, 3 and 2.

D8, 3 and 2.18The action of dilute sulphuric acid on iron(III) hydroxide can be represented by the following

equation: wFe(OH)3(s) + xH2SO4(aq) ( yFe2(SO4)3(aq) + zH2O(l)

The values of w, x, y and z in the balanced equation should be

A1, 3, 1 and 2.

B2, 3, 2 and 6.

C2, 3, 1 and 6.

D2, 6, 1 and 3.19Consider the following ionic equation:Cu(s) + 4H+(x) + 2NO3-(aq) ( Cu2+(y) + 2NO2(z) + 2H2O(l)


xyz

Alaqaq

Bllg

Caqaql

Daqaqg20 The reaction between zinc nitrate solution and sodium hydrogencarbonate solution can be represented by the ionic equation below:

Zn2+(aq) + 2HCO3-(aq) ( ZnCO3(x) + H2O(y) + CO2(z)


xyz

Aaqlg

Baqaqaq

Csaqg

Dslg21Consider the following ionic equation:

2MnO4-(aq) + xH+(aq) + 2yI- (aq) ( 2Mn2+(aq) + yI2(aq) + zH2O(l)


xyz

A412

B432

C834

D165822Which of the following equations CANNOT be rewritten into an ionic equation?

(1)Zn(s) + 2HCl(aq) ( ZnCl2(aq) + H2(g)

heat

(2)2Pb(NO3)2(s) ( 2PbO(s) + 4NO2(g) + O2(g)

(3)Ca(OH)2(aq) + CO2(g) ( CaCO3(s) + H2O(l)

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only23The following equation is related to the manufacture of ammonia:

N2(g) + 3H2(g) 2NH3(g)

Which of the following statements can be deduced from the above equation?

(1)The reaction is reversible.

(2)The forward reaction and backward reaction occur simultaneously.

(3)A catalyst should be used.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)10.9: Displacement reactions(CDC guide: Displacement reactions and their interpretations based on reactivity series)

1Which of the following ions can be displaced by lead?

AFe2+(aq)

BCu2+(aq)

CMg2+(aq)

DAl3+(aq)2In which of the following cases will a reaction take place?

ACu(s) + Zn2+(aq)

BAg(s) + Fe2+(aq)

CAl(s) + Cu2+(aq)

DPb(s) + Mg2+(aq)3Which of the following metals will displace aluminium from aluminium sulphate solution?AZinc

BIron

CMagnesium

DLead4Silver nitrate solution can be stored in metal containers made of

Aaluminium.

Bzinc.

Ccopper.

Dgold.5When a piece of lead is dropped into an aqueous solution of compound X, the lead gradually dissolves. X could be

Acopper(II) nitrate.

Bzinc nitrate.

Cmagnesium sulphate.

Dammonium chloride.6 Tin is in between iron and lead in the reactivity series. Which of the following can be deduced from this information?

ATin reacts with steam vigorously to give an oxide.

BTin displaces iron from iron(II) nitrate solution.

CTin reacts with oxygen more readily than lead does.

DA tin ion carries 2 positive charges.7 A copper wire is put into silver nitrate solution in a test tube. What will be observed after a few minutes?Colour change of solution

Copper

A

Blue to pale blue

Brown solids formed on copper surface

B

Blue to pale blue

Grey solids formed on copper surface

C Remains unchanged

Shiny solids formed on top of the solution

D

Colourless to blue

Grey solids formed on copper surface8Which of the following will NOT react with each other?AZinc and steamBIron and dilute sulphuric acidCSilver and copper(II) sulphate solutionDLead and oxygen9In each of the four solutions shown below, a strip of magnesium is added.


TubeObservation

AI Grey coating on magnesium

BII Brown coating on magnesium

CIII Bubbles are given off

DIV Grey coating on magnesium10Which of the following statements concerning lead is correct?

AIt can be obtained by heating lead(II) oxide strongly in air.

BIt can displace zinc from zinc nitrate solution.

CIt shows moderate reaction with steam.

DIts oxide is yellow when cool.11 Which of the following equations represents a displacement reaction that would NOT occur at room temperature?

APb(s) + Zn2+(aq) ( Pb2+(aq) + Zn(s)

BMg(s) + Fe2+(aq) ( Mg2+(aq) + Fe(s)

CFe(s) + Cu2+(aq) ( Fe2+(aq) + Cu(s)

DZn(s) + 2Ag+(aq) ( Zn2+(aq) + 2Ag(s)12Zinc nitrate solution should NOT be stored in

(1)a magnesium container.

(2)a plastic container.

(3)a zinc container.

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only13Which of the following are correct when excess iron is added to lead(II) nitrate solution?

(1)A pale green solution is obtained.

(2)Some grey solids are deposited on the iron surface.

(3)A gas is evolved.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)14X is an element with an electronic arrangement of 2, 8, 1. Which of the following statements concerning X is / are correct?

(1)X burns in air with a golden yellow flame.

(2)X is extracted by reduction with carbon.

(3)A gas is given off when X reacts with zinc sulphate solution.

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only15A piece of magnesium is dropped into a beaker of copper(II) sulphate solution. Which of the

following will be observed?

(1)Gas bubbles are evolved.

(2)A brown layer forms on the surface of magnesium.

(3)The colour of the blue solution fades.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)10.11: Relationship between the extraction method and position of metals in thereactivity series(CDC guide: Relation between the extraction method for a metal and its position in the metal reactivity series)

1Which of the following metal oxides is most difficult to be reduced?

AMgO

BCuO

CZnO

DFeO2How could calcium be extracted from solid calcium chloride?

ABy displacement reaction with magnesium

BBy melting it and passing electricity through the molten calcium chloride

CBy passing electricity through solid calcium chloride

DBy strongly heating calcium chloride with carbon3Tin is just below iron in the metal reactivity series. Oxide of tin can be reduced to tin by

Aheating the oxide with lead.

Bheating the oxide strongly.

Cheating the oxide with carbon.

Delectrolysis of the aqueous solution of the oxide.4Metal X is just below zinc in the reactivity series. Which of the following reactions are most likely to occur? heat

(1)2XO(s) + C(s) ( 2X(s) + CO2(g)

heat

(2)2XO(s) ( 2X(s) + O2(g) (3)X(s) + Cu2+(aq) (X2+(aq) + Cu(s)

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)5A metal at the top of the reactivity series would be expected to

(1)have a shiny appearance.

(2)form an oxide which is stable to heat.

(3)be extracted by heating its ore with carbon.

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only6Nickel is in between iron and lead in the reactivity series. Which of the following statements concerning nickel are probably correct?

(1)Nickel(II) oxide can be reduced by carbon.

(2)Nickel can displace silver from silver nitrate solution.

(3)Nickel reacts with dilute sulphuric acid to give hydrogen.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)7Metal X reacts with hot water more readily than metal Y does. Which of the following statements are probably correct?

(1)X displaces Y from the solution of nitrate of Y.

(2)It is more difficult to reduce the oxide of X when compared to the oxide of Y.

(3)Both X and Y react with steam to form hydroxides.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)10.12: Prediction of metal reactions using the reactivity series(CDC guide: Prediction of metal reactions using the reactivity series)

1 Chromium lies between zinc and iron in the reactivity series. Which of the following statements is INCORRECT?

AWhen chromium powder is added to copper(II) sulphate solution, a brown deposit will form.

BChromium reacts with dilute hydrochloric acid to liberate hydrogen.

CMagnesium is more reactive than chromium.

DChromium is usually obtained by electrolysis of its molten ore.2 Metal X is more reactive than platinum but less reactive than iron. Which of the following statements is most likely to be correct?

AX burns vigorously in air to form an oxide.

BX reacts with dilute hydrochloric acid vigorously.

CX displaces iron from iron(II) sulphate solution.

DThe oxide of X can be reduced by heating with carbon.3 X, Y and Z are metals. X displaces Y from the solution of chloride of Y, but has no reaction with the solution of nitrate of Z. The reactivity of the three metals in descending order is

AX, Y, Z.

BX, Z, Y.

CZ, X, Y.

DZ, Y, X.4 X, Y and Z are metals. The oxides of X and Y can be reduced by heating with carbon, but the oxide of Z cannot. Y displaces X from a solution of nitrate of X. The descending order of reactivity of the three metals is

AX, Y, Z.

BX, Z, Y

CZ, X, Y.

DZ, Y, X.5 X, Y and Z are metals. Metals Y and Z have no reaction with steam while metal X reacts with water to liberate hydrogen. Only metal Y is found free in nature. The order of increasing

reactivity of the three metals is

AX, Y, Z.

BX, Z, Y.

CY, X, Z.

DY, Z, X.6 Metals X and Y both have no reaction with cold water. X reduces iron(II) oxide on heating. Copper displaces Y from a solution of nitrate of Y. The descending order of reactivity of the four metals is

AX, Fe, Cu, Y.

BFe, X, Cu, Y.

CX, Fe, Y, Cu.

DY, Cu, Fe, X.7 Metal X reacts with dilute hydrochloric acid to liberate hydrogen, but metals Y and Z have no reaction with the acid. The oxide of Y decomposes on heating but the oxide of Z does not. The order of decreasing reactivity of the three metals should be

AX, Y, Z.

BX, Z, Y.

CZ, Y, X.

DZ, X, Y.8 The properties of four metals are listed in the table below:MetalProperties

Wdoes not react with dilute hydrochloric acid

Xburns in air to give an orange solid, which becomes yellow on cooling

Yreacts with steam slowly but not with cold water

Zcan be extracted from its ore by electrolysis only

The order of decreasing reactivity is probably

AX, Y, W, Z.

BX, Z, Y, W.

CZ, Y, X, W.

DZ, X, Y, W.Directions: Questions 9 and 10 refer to the results of an experiment for three metals X, Y and Z.Action of metal on copper (II) sulphate solution

XCopper is deposited.

YA gas is evolved.

ZNo reaction

9The order of increasing reactivity of the three metals should be

AY < X < Z.

BX < Z < Y.

CZ < Y < X.

DZ < X < Y.10Y could be

Azinc.

Bmagnesium.

Csodium.

Dcopper.

11X, Y and Z are metals. Metal Y reacts with dilute hydrochloric acid to liberate hydrogen while metals X and Z do not. Only metal X is known to be used since ancient times. The descending order of reactivity of the three metals is

AY, X, Z.

BY, Z, X.

CZ, X, Y.

DZ, Y, X.

12A student performed tests to investigate the reactivity of three metals. In each test, a metal

strip was placed in a solution containing ions of a different metal. The results are shown in thediagrams.

What is the order of reactivity of the metals, based on these results?

AX > Z > Y

BY > X > Z

CZ > Y > X

DZ > X > Y

Directions: Questions 13 and 14 refer to the results of experiments for three metals X, Y and Z, and their compounds.MetalReaction with

cold waterAction of heat

on metal oxide

XNo reactionNo reaction

YHydrogen liberatedNo reaction

ZNo reactionMetal and oxygen formed

13The descending order of reactivity of the three metals is

AX, Y, Z.

BX, Z, Y.

CY, X, Z.

DY, Z, X.

14Which of the following statements concerning Y are probably correct?

(1)Y reacts with water to give a hydroxide.

(2)Y is extracted by electrolysis of its molten ore.

(3)Y has been used by humans since ancient times.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

15In which of the following experiments would a metal be produced?

(1)Heating iron(III) oxide with aluminium

(2)Adding zinc to silver nitrate solution

(3)Heating copper with magnesium oxide

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

16Caesium is an alkali metal. Which of the following statements are correct?

(1)It loses electrons more readily than potassium does.

(2)It reacts with oxygen vigorously.

(3)It reacts with water to give an alkaline solution.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

17Barium is a Group II element. Which of the following statements concerning barium are

correct?

(1)It reacts with dilute hydrochloric acid to give hydrogen.

(2)It is extracted by electrolysis of its molten ore.

(3)It reacts with water to give barium oxide.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

18Strontium is a Group II element. Which of the following statements concerning strontium

are correct?

(1)It can be obtained by heating strontium oxide with carbon.

(2)It reacts with water readily.

(3)It is more reactive than calcium.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

19Tin is a metal just above lead in the reactivity series. Which of the following statementsconcerning tin are probably correct?

(1)It is extracted by electrolysis of its molten ore.

(2)An oxide is formed when tin is heated in air.

(3)It shows no reaction with cold water.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

20X and Y are two different metals. Which of the following show(s) that Y is more reactivethan X?

(1)X forms an ion with a charge of +2 while Y forms an ion with a charge of +3.

(2)The oxide of X undergoes decomposition upon strong heating but the oxide of Y does not.

(3)X reacts with steam but Y does not.

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) onlyUnit 11

11.1: Calculating the quantity of substances

11.2: Counting numbers by weighing

11.3: What is a mole?11.4: What is molar mass?(CDC guide: Quantitative relationship of the reactants and products in a reaction as revealed from a chemical equation & Mole, Avogadro's constant and molar mass)

11 mole of potassium oxide contains

A1 mole of molecules.

B2 moles of cations.

C2 moles of anions.

D3 moles of atoms.

2How many atoms are present in 0.600 mole of carbon dioxide molecules?

(Avogadro constant = 6.02 ( 1023 mol-1)

A0.6

B1.8

C3.61 ( 1023

D10.8 ( 102333 moles of magnesium chloride contains

A3 moles of molecules.

B6 moles of cations.

C6 moles of anions.

D9 moles of atoms.

4Consider the chemical equation:

2Ca(s) + O2(g) ( 2CaO(s)

Which of the following statements are correct?

(1)Calcium and oxygen are reactants.

(2)Calcium oxide is the product.

(3)2 moles of calcium react with 1 mole of oxygen to give 2 moles of calcium oxide.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

5Which of the following statements are correct?

(1)One mole is the quantity of a substance that contains Avogadro number of particles.

(2)One mole of zinc and one mole of iron have different masses.

(3)The molar mass of a substance is the mass in gram of one mole of it.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

6The Avogadro constant

(1)has the numerical value of 6.02 ( 1023.

(2)varies with temperature and pressure.

(3)is represented by the symbol L.

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only

7The molecular formula of ozone is O3. Which of the following statements concerning 1 mole of ozone is / are correct?

(Avogadro constant = 6.02 ( 1023 mol-1; relative atomic mass: O = 16.0)

(1)Its mass is 48.0 g.

(2)It contains 3 moles of molecules.

(3)It contains 3 ( 6.02 ( 1023 atoms.

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only

8Which of the following statements concerning 1 mole of magnesium is / are correct?

(Avogadro constant = 6.02 ( 1023 mol-1; relative atomic mass: Mg = 24.3)

(1)It can form 1 mole of Mg2+ ions.

(2)It can form 2 ( 6.02 ( 10 23Mg2+ ions.

(3)The mass of 1 mole of Mg2+ ions is 48.6 g.

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only

9Which of the following statements concerning 1 mole of sulphur dioxide are correct?

(Avogadro constant = 6.02 (1023 mol-1; relative atomic masses: O = 16.0, S = 32.1)

(1)It contains 3 moles of atoms.

(2)It contains 3 ( 6.02 ( 1023 ions.

(3)Its mass is 64.1 g.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

11.5: Calculations involving moles and masses(CDC guide: Calculations related to moles and reacting masses)

1If 2.00 g of oxygen gas contains x molecules, how many molecules are present in 28.0 g ofnitrogen gas?

(Relative atomic masses: N = 14.0, O = 16.0)

Ax

B4x

C8x

D16x

2If there are x molecules in 17.75 g of chlorine, how many molecules are present in 8.00 g ofsulphur dioxide ?

(Relative atomic masses: O = 16.0, S = 32.1, Cl = 35.5)

Ax/4

Bx/2

Cx

D2x

3The molecular formula of a gas is X3. If the Avogadro number is L mol-1, how many atoms are

there in 48.0 g of X3?

(Relative atomic mass: X = 16.0)

A1/2 L

BL

C2 L

D3 L

4If 2.0 g of carbon monoxide gas contain x molecules, how many molecules are present in 1.0 gof hydrogen gas?

(Relative atomic masses: H = 1.0, C = 12.0, O = 16.0)

A3.5x

B5.5x

C7x

D11x

5Which of the following gases, each having a mass of 3.00 g, has the largest number ofmolecules at room temperature and pressure?

(Relative atomic masses: H = 1.0, C = 12.0, O = 16.0, F = 19.0, Ar = 40.0)

AOxygen

BHydrogen fluoride

CCarbon dioxide

DArgon

6Which of the following gases contains the largest number of molecules at room temperatureand pressure?

(Relative atomic masses: H = 1.0, C = 12.0, N = 14.0, O = 16.0, F = 19.0, Cl = 35.5)

A4.0 g of hydrogen chloride

B18.0 g of ammonia

C38.0 g of fluorine

D58.0 g of carbon dioxide

7The molecular formula of a gas is X2. If the relative atomic mass of X is 14.0, what is the

number of molecules in 112 g of the gas?


A4

B8

C4 ( 6.02 ( 1023

D8 ( 6.02 ( 10238The formula of ozone is O3. If 1 mole of ozone contains y atoms, how many atoms will 2moles of oxygen gas contain?

A

By

C

D4y 9Element X forms two oxides, XO2 and XO3. If 1 mole of XO2 contains n atoms, 3 moles of

XO3 would contain

A3n atoms.

B4n atoms.

C5n atoms.

D6n atoms.

10Which of the following gases contains the same number of atoms as 2.20 g of carbon dioxide?

(Relative atomic masses: H = 1.0, C = 12.0, N = 14.0, O = 16.0, F = 19.0)

A3.40 g of ammonia

B2.30 g of nitrogen dioxide

C0.30 g of hydrogen

D1.90 g of fluorine

11Metal X forms an oxide. 32.0 g of this oxide contains 23.2 g of X. What is the mole ratio of Xto oxygen in the oxide?

(Relative atomic masses: O = 16.0, X = 56.0)

A1 : 1

B1 : 2

C2 : 3

D3 : 4

12An oxide of element X has the formula X2O3. 14.3 g of this oxide contains 7.56 g of X. Whatis the relative atomic mass of X?

(Relative atomic mass: O = 16.0)

A12.0

B18.0

C27.0

D36.0

13A solid mixture of iron(II) nitrate and iron(II) carbonate contains 1.0 mole of nitrate ions and1.2 moles of iron(II) ions. What is the number of moles of carbonate ions in the mixture?

A0.35

B0.70

C1.4

D1.7

14What is the mass of oxygen in 24.0 g of pure nitric acid (HNO3)?

(Relative atomic masses: H = 1.0, N = 14.0, O = 16.0)

A6.10 g

B8.00 g

C12.2 g

D18.3 g

15What mass of water of crystallization is contained in 30.0 g of XSO4(5H2O with a molar mass

of 250.1 g mol-1?

(Relative atomic masses: H = 1.0, O = 16.0)

A10.8 g

B18.0 g

C14.4 g

D21.6 g

16Plaster of Paris is used for setting broken limbs. Its formula is CaSO4(H2O. When water isadded, it sets to give gypsum, CaSO4(2H2O. What is the minimum mass of water needed toset 0.500 kg of plaster of Paris?

(Relative atomic masses: H = 1.0, O = 16.0, S = 32.1, Ca = 40.1)

A62.0 g

B93.0 g

C124 g

D290 g17The relative atomic masses of carbon and oxygen are 12.0 and 16.0 respectively. Which of the

following statements concerning 88.0 g of carbon dioxide is correct?


AIt contains 4 moles of oxygen atoms.

BIt contains 4 moles of molecules.

CIt contains 6 ( 6.02 ( 1023 molecules.

DIt contains 8 ( 6.02 ( 1023 atoms.

18Which of the following statements concerning 0.50 mole of nitrogen gas are correct?

(1)It contains the same number of atoms as 4.0 g of helium gas.

(2)It has a mass of 7.0 g.

(3)It contains 3.01 ( 1023 molecules of nitrogen.

(Relative atomic masses: He = 4.0, N = 14.0; Avogadro constant = 6.02 ( 1023 mol-1)

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

191 mole of sulphur atoms has a mass twice that of 1 mole of oxygen atoms. Which of thefollowing statements is / are correct?

(1)2 g of sulphur contains twice the number of atoms as 1 g of oxygen.

(2)The number of atoms contained in 1 mole of sulphur atoms is the same as thatcontained in 1 mole of oxygen atoms.(3)The number of S2- ions formed from 1 mole of sulphur atoms is twice that of O2-ions formed from 1 mole of oxygen atoms.

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only

11.6: Percentage by mass of an element in a compound

(CDC guide: Percentage by mass of an element in a compound )

1What is the percentage by mass of water of crystallization in FeSO4(7H2O?

(Relative atomic masses: H = 1.0, O = 16.0, S = 32.1, Fe = 55.8)

A45.3 %.

B56.0 %.

C72.0 %.

D84.6 %.

2What is the percentage by mass of X in K2X2O7?

(Relative atomic masses: O = 16.0, K = 39.1, X = 52.0)

A17.7 %

B25.1 %

C35.4 %

D40.8 %

3Which of the following fertilizers contains the lowest percentage by mass of nitrogen?

(Relative atomic masses: H = 1.0, N = 14.0, O = 16.0, Na = 23.0, S = 32.1, Cl = 35.5,K = 39.1)

APotassium nitrate

BSodium nitrate

CAmmonium chloride

DAmmonium sulphate

4Assuming that the effectiveness of a nitrogen-containing fertilizer is proportional to thepercentage by mass of nitrogen in the compound, which of the following compounds is themost effective fertilizer?

Relative molecular mass

ACO(NH2)2 60.0

BNH4NO3

80.0

CNaNO3

85.0

D(NH4)2HPO4

132.05An ore sample contains 75.0% by mass of AlCl3 while the other ingredients do not containaluminium. What is the percentage by mass of aluminium in the sample?(Relative atomic masses: Al = 27.0, Cl = 35.5)

A15.2%.

B25.2%.

C35.2%.

D45.2%.

6A silver coin, with a mass of 12.0 g, was dissolved completely in concentrated nitric acid togive silver nitrate solution. When excess potassium chloride solution was added to theresulting solution, 14.4 g of a white precipitate were obtained. What is the percentage by massof silver in the coin?

(Relative atomic masses: Cl = 35.5, Ag = 107.9)

A45.0%

B60.0%

C75.0%

D90.0%

7A salt, KCl(MgCl2(nH2O, contains 38.9% by mass of water of crystallization. What is the

value of n?

(Relative atomic masses: H = 1.0, O = 16.0, Mg = 24.3, K = 39.1, Cl = 35.5)

A5

B6

C7

D18

8The compound X2S contains 70.8% by mass of X. What is the relative atomic mass of X?

(Relative atomic mass: S = 32.1)

A17.5

B23.0

C39.0

D80.0

9XCl4 contains 16.5 % by mass of X. What is the relative atomic mass of X?

(Relative atomic mass: Cl = 35.5)

A26.5

B28.0

C30.5

D36.0

10An element forms an oxide X2O5, which contains 35.0% by mass of oxygen. What is therelative atomic mass of X?


A3.45

B21.5

C43.1

D74.3

11A sample of paint pigment of mass 1.50 g is dissolved and the lead ions in it are separated byprecipitation as solid PbSO4. The precipitate has a mass of 0.0849 g. What is the percentageby mass of lead in the pigment?

(Relative atomic masses: O = 16.0, S = 32.1, Pb = 207.2)

A3.87%

B5.66%

C5.80%

D12.7%

11.7: Determining the empirical formula of a compound from experimental data(CDC guide: Empirical formulae derived from experimental data)

12 moles of atoms of X combines with 16.0 g of oxygen to form an oxide. What is theempirical formula of this oxide?


AXO

BXO2

CXO3

DX2O

2A compound is formed when 71.0 g of chlorine combine with 48.0 g of oxygen. What is theempirical formula of the compound?

(Relative atomic masses: O = 16.0, Cl = 35.5)

AClO

BClO2

CCl2O

DCl2O33Heating 4.80 g of an element X gives 9.60 g of its oxide. What is the empirical formula of theoxide?

(Relative atomic masses: O = 16.0, X = 32.1)

AXO

BX2O

CXO2

DXO34A compound contains carbon and hydrogen only. If the percentage by mass of hydrogen in thecompound is 25.0%, what is its empirical formula?

(Relative atomic masses: H = 1.0, C = 12.0)

ACH

BCH2

CCH3

DCH45A compound contains 34.4% of nickel, 28.1% of carbon and 37.5% of oxygen by mass. Whatis its empirical formula?

(Relative atomic masses: C = 12.0, O = 16.0, Ni = 58.7)

ANiCO

BNi(CO)4

CNiCO3

DNi(CO)26What is the empirical formula of a compound with the following composition by mass?

Na = 36.5% S = 25.4% O = 38.1%

(Relative atomic masses: O = 16.0, Na = 23.0, S = 32.1)

ANaSO3

BNaSO4

CNa2SO3

DNa2SO47Vitamin C contains 40.9% of carbon, 4.60% of hydrogen and 54.5% of oxygen by mass.What is the empirical formula of vitamin C?

(Relative atomic masses: H= 1.0, C = 12.0, O = 16.0)

ACH2O

BC2H3O2

CC3H4O3

DC4H5O4832.2 g of an oxide of metal M, when completely reduced by carbon, produced 4.95 g of carbon

dioxide. What is the empirical formula of the oxide?

(Relative atomic masses: C = 12.0, O = 16.0, M = 63.5)

AMO

BM2O

CMO2

DM2O39A compound contains 18.2% of lithium, 71.2% of aluminium and 10.6% of hydrogen by mass.What is its empirical formula?

(Relative atomic masses: H = 1.0, Li = 6.9, Al = 27.0)

ALiAlH2

BLiAlH4

CLi2AlH5

DLi3AlH510The relative atomic mass of metal X is 52.0. 33.8 g of X are allowed to react with steam.The mass of oxide obtained is 49.4 g. What is the empirical formula of the oxide?


AX2O

BXO

CX2O3

DX3O411Metal X forms an oxide with the empirical formula X2O. Upon strong heating, the oxidedecomposes according to the following equation:

2X2O(s) ( 4X(s) + O2(g)

(

Complete decomposition of 55.7 g of the oxide gives 3.84 g of oxygen. What is the relativeatomic mass of X?


A54.0

B108.0

C162.0

D216.0

12A compound contains carbon and hydrogen only. It contains 16.3% by mass of hydrogen.The relative molecular mass of the compound is 86.0. What is its molecular formula?

(Relative atomic masses: H= 1.0, C = 12.0)

AC3H7

BC6H14

CC7H2

DC7H1613A compound contains 54.5% by mass of carbon, 9.10% by mass of hydrogen and the restbeing oxygen. The relative molecular mass of this compound is 88.0. What is its molecularformula?

(Relative atomic masses: H= 1.0, C = 12.0, O = 16.0)

AC2H4O

BC3H4O3

CC4H8O2

DC5H12O

11.8: Mole ratio in a balanced chemical equation11.9: Chemical equations and reacting masses11.10: Limiting reactants11.11: Theoretical yield and actual yield(CDC guide: Reacting masses from chemical equations)

124.4 g of a hydrated metal sulphate were heated to a constant mass. After cooling to roomtemperature, the anhydrous metal sulphate weighed 11.9 g. How many moles of water ofcrystallization are there in one mole of the hydrated metal sulphate?

(Relative formula / molecular masses: anhydrous metal sulphate = 120.4, water = 18.0)

A4

B5

C7

D10

24.68 g of metal X combine with 2.16 g of oxygen to form an oxide in which the charge of theion of X is +3. What is the relative atomic mass of X?


A11.6

B34.7

C52.0

D104

3The formula of hydrated sodium carbonate crystals is Na2CO3(xH2O. When 66.9 g of thehydrated crystals are heated, 24.8 g of anhydrous sodium carbonate are produced. What is thevalue of x?

(Relative atomic masses: H = 1.0, C = 12.0, O =16.0, Na = 23.0)

A3

B5

C7

D104What mass of iron is obtained when 0.400 mole of iron(III) oxide is completely reduced bycarbon monoxide?(Relative atomic mass: Fe = 55.8)

A33.6 g

B44.6 g

C67.2 g

D96.1 g

5The formula of hydrated zinc sulphate is ZnSO4(xH2O. On strong heating, 18.7 g of thehydrated sulphate produces 8.19 g of water. What is the value of x?

(Relative atomic masses: H = 1.0, O = 16.0, S = 32.1, Zn = 65.4)

A5

B6

C7

D8

6The following equation represents the reaction of an oxide of iron with carbon:

Fe3O4(s) + 2C(s)( 3Fe(s) + 2CO2(g)

What mass of iron would be obtained if 81.0 g of the oxide were consumed in the reaction?

(Relative atomic masses: O = 16.0, Fe = 55.8)

A19.5 g

B39.0 g

C58.6 g

D78.1 g

7Aluminium can be produced from aluminium oxide by the following reaction:

Al2O3(s) + 3Mg(s) ( 2Al(s) + 3MgO(s)

What mass of aluminium oxide is required to produce 11.9 g of aluminium?

(Relative atomic masses: O = 16.0, Al = 27.0)

A22.4 g

B33.6 g

C44.8 g

D67.3 g

8NaHCO3 decomposes upon heating to form Na2CO3, CO2 and H2O. What is the mass ofNa2CO3 obtained if 126 g of NaHCO3 undergo complete decomposition?

(Relative atomic masses: H = 1.0, C = 12.0, O = 16.0, Na = 23.0)

A79.5 g

B84.0 g

C106 g

D159 g

9A solid mixture consists of 1.0 mole of calcium carbonate and 1.0 mole of sodium carbonate.What is the least number of moles of hydrochloric acid required to liberate all the carbondioxide from the mixture?

A1.5

B2.0

C3.0

D4.0

10Consider the following equation:

2NH3(g) + 3CuO(s) ( N2(g) + 3H2O(l) + 3Cu(s)

What mass of ammonia would be required to give 0.450 mole of water in the reaction?

(Relative atomic masses: H = 1.0, N = 14.0)

A5.10 g

B7.65 g

C11.4 g

D15.3 g

11Ammonium dichromate ((NH4)2Cr2O7) decomposes on heating to give chromium(III) oxide,water and nitrogen. What mass of water is obtained when 277 g of (NH4)2 Cr2O7 undergocomplete decomposition?

(Relative atomic masses: H = 1.0, N = 14.0, O = 16.0, Cr = 52.0)

A19.8 g

B39.6 g

C79.2 g

D158 g

12Consider the following equation:

X2(g) + 3Y2(g) ( 2XY3(g)

If 4 moles of X2(g) react with 6 moles of Y2(g), what is the number of moles of XY3(g)formed?

A2

B4

C8

D1013The following equation represents the reaction of propane (C3H8) with oxygen:

C3H8(g) + 5O2(g) ( 3CO2(g) + 4H2O(l)

What is the mass of carbon dioxide formed when 3 moles of propane react with 10 moles of oxygen?

(Relative atomic masses: C = 12.0, O = 16.0)

A132 g

B264 g

C308 g

D396 g

144.00 moles of hydrochloric acid react with 72.0 g of magnesium. What is the mass ofhydrogen produced?

(Relative atomic masses: H = 1.0, Mg = 24.3)

A2.00 g.

B3.00 g.

C4.00 g.

D6.00 g.

15Hydrazine (N2H4) is used as rocket fuel. It reacts with oxygen according to the followingequation:

N2H4(l) + O2(g) (N2(g) + 2H2O(l)

In a particular rocket engine, 2.40 g of hydrazine and 3.40 g of oxygen are allowed to react.What is the mass of water produced?

(Relative atomic masses: H = 1.0, N = 14.0, O = 16.0)

A1.35 g

B1.90 g

C2.70 g

D3.80 g

16Sodium and chlorine react according to the following equation:

2Na(s) + Cl2(g) (2NaCl(s)

12.5 g of sodium and 25.5 g of chlorine are allowed to react. What is the mass of sodiumchloride formed?

(Relative atomic masses: Na = 23.0, Cl = 35.5)

A31.8 g

B42.0 g

C63.5 g

D84.0 g

17In the combustion of a certain fuel, 16.0 g of carbon dioxide are produced. This represents a75.0% yield. What is the theoretical yield of carbon dioxide?

A12.0 g

B21.3 g

C32.0 g

D44.3 g18Calcium carbonate can be decomposed by heating. When 24.8 g of calcium carbonate were

heated, 13.1 g of calcium oxide were obtained. What is the percentage yield of calcium oxide?

(Relative atomic masses: C = 12.0, O = 16.0, Ca = 40.1)

A24.8%

B52.8%

C72.4%

D94.4%

19Manufacturing ammonia in industry involves the reaction between nitrogen and hydrogen.

N2(g) + 3H2(g) 2NH3(g)A sufficient amount of hydrogen is allowed to react with 10.0 moles of nitrogen. Suppose thatthe conversion of nitrogen to ammonia is 15.0%. What is the mass of ammonia formed?

(Relative atomic masses: H = 1.0, N = 14.0)

A20.0 gB51.0 g

C113 g

D340 g

20When copper is heated with an excess of sulphur, copper(I) sulphide is formed accordingto the following equation:

2Cu(s) + S(s) ( Cu2S(s)

In a particular experiment, 2.40 g of copper were heated with excess sulphur to obtain 2.85 gof copper(I) sulphide. What is the percentage yield of the reaction?

(Relative atomic masses: S = 32.1, Cu = 63.5)

A80.8%

B84.8%

C90.8%

D94.8%Unit 1212.1: What is corrosion?

12.2: Corrosion of iron: rusting

(CDC guide: Corrosion of iron)

1The chemical formula of rust is

AFeO.

BFe2O3.

CFeO(nH2O.

DFe2O3(nH2O.

2Which of the following iron nails would NOT rust after 3 days?

3The diagrams below represent four tests in an experiment designed to find out the necessaryconditions for rusting. Which diagram represents the most favorable conditions for rust toappear on the nail?

4Iron corrodes more easily than other metals, but iron is still widely used in daily life. Which ofthe following are possible reasons?

(1)Iron is strong.

(2)Iron is cheap.

(3)There are many methods used to prevent iron from corrosion.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

5Which of the following statements are correct?

(1)Corrosion is the deterioration of a metal due to its reactions with substances in the

environment.

(2)Copper is more corrosion resistant than iron.

(3)Rusting is the corrosion of iron.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

6Which of the following conditions are essential for rusting to occur?

(1)Oxygen

(2)High temperature

(3)Water

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

12.3: What factors speed up the rusting process?12.4: To observe rusting using a rust indicator(CDC guide: Factors that influence the rusting of iron)

1The rate of rusting is the fastest when iron is connected to

Acopper.

Bsilver.

Czinc.

Dlead.

2Iron rusts faster in sea water than in distilled water because

Asea water is more acidic.

Bsea water contains ionic substances.

Csea water contains more oxygen.

Dsea water is more corrosive.

3Which iron nail in the test tubes shown below would rust most rapidly?

4Which iron nail in the test tubes shown below would rust most slowly?

5An iron nail is covered with water. Which of the following actions would NOT increase the

rate at which the nail corrodes?

AAdding some sodium sulphate to the water

BAdding some glucose to the water

CAttaching a copper wire to the nail

DBubbling carbon dioxide into the water

6In which of the following cases would the rusting of iron nail be fastest?

7In which of the following cases would the rusting of iron nail be slowest?

8Two experiments are set-up below to study the corrosion of an iron nail.

The rust indicator turns blue if the nail rusts. After a short time, blue colour will appear at

Aboth P and Q.

Bneither P nor Q.

CP but not at Q.

DQ but not at P.

9The process of rusting is speeded up

(1)in the presence of sodium chloride solution.

(2)at a higher temperature.

(3)in the presence of dilute sulphuric acid.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

10Which iron nail(s) below should be free from rusting after a long time?

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only

11Car exhaust pipes rust rapidly because

(1)car exhaust gases are acidic.

(2)car exhaust gases contain water vapour.

(3)car exhaust pipes are subject to high temperature.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

12In which of the following beakers would the iron NOT rust?

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only

Directions: Questions 13 and 14 refer to three different pairs of metal wires, which are placedseparately in petri dishes containing rust indicator solution.

13If the iron wire rusts, what would be the colour of the rust indicator around the wire?

ABlue

BOrange

CRed

DYellow

14Which of the following statements is / are correct?

(1)The iron wire in dish I corrodes readily.

(2)The iron wire in dish II corrodes readily.

(3)The iron wires in dish III do not corrode.

A(1) only

B(2) only

C(1) and (3) only

D(2) and (3) only

12.5: How to prevent rusting?

12.6: Socioeconomic implications of rusting12.7: Which is the most suitable method to protect a particular iron article from rusting?(CDC guide: Methods used to prevent rusting)

1Which of the following methods CANNOT prevent iron from rusting?

AChromium-plating

BWrapping a copper wire around the iron object

CCoating with oil

DCoating the surface with plastic

2Tin-plating can prevent iron from rusting because

Atin protects iron from air and water.

Btin corrodes instead of iron.

Ctin is higher than iron in the reactivity series.

Dtin is less reactive than iron.3Tin-plated iron instead of galvanized iron is used to make food cans because

Atin corrodes less rapidly than zinc in air.

Btin and iron form an alloy which does not corrode.

Ctin ions are non-toxic while zinc ions are toxic.

Dtin is cheaper than zinc.

4The hull of a ship can be protected from corrosion by attaching a piece of metal to it.Themetal could be

Airon.

Bpotassium.

Ctin.

Dzinc.

5Which of the following methods can be used to prevent a bicycle chain from rusting?

ACoating with paint

BCoating with grease

CAttaching a piece of zinc to it

DCoating with plastic

6Which of the following methods can be used to prevent a sewing needle from rusting?

ASacrificial protection

BCoating with oil

CUsing alloys of iron

DCoating with paint

7Which of the following combinations is INCORRECT?

Iron article

Method to prevent iron from rusting

ABath tap

Chromium-plating

BFence

Painting

CDoor hinge

Galvanization

DUnderground pipeline

Sacrificial protection

8Zinc coating can prevent iron from rusting because

Azinc is more reactive than iron.

Bzinc is harder than iron.

Czinc forms a protective layer on the surface of iron.

Dzinc loses electrons more readily than iron.

9Which of the following metals can offer both a protective layer and sacrificial protection to aniron object?

AZinc

BSilver

CLead

DCopper

10Painting is NOT used to protect door hinges because

Apaint is expensive.

Bpaint is easily scratched off.

Cit is difficult to attach paint to door hinges.

Dpainting causes harm to environment.

11Which of the following CANNOT protect iron from rusting?

AIron coated with tin

BIron alloyed with chromium

CIron covered with plastic

DIron connected to tin

12Stainless steel is seldom used to make large objects because

Ait is not strong enough.

Bit is not malleable enough.

Cit is too expensive.

Dit is difficult to produce.13Which of the following methods can prevent iron from rusting?

(1)Anodization

(2)Tin-plating

(3)Galvanization

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

14Which of the following processes could be used to slow down the corrosion of an iron nail?

(1)Painting the nail

(2)Coating a layer of zinc on the nail

(3)Putting the nail in distilled water

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

15Which of the following are commonly used as protective metals to prevent rusting of iron?

(1)Chromium

(2)Zinc

(3)Tin

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

16Which of the following are examples of sacrificial protection against rusting?

(1)Food cans coated with tin

(2)Underground iron pipes connected to bags of magnesium

(3)Hull of a ship connected to zinc blocks

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

17Which of the following processes CANNOT slow down the corrosion of an iron nail?

(1)Wrapping a copper wire around the iron nail

(2)Putting the iron nail in oil

(3)Attaching a piece of silver to the iron nail

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

12.8: Corrosion resistance of aluminium

(CDC guide: Corrosion resistance of aluminium & Anodization as a method to enhance corrosion resistance of aluminium)

1Why is aluminium a good choice for the manufacture of outdoor structures?

AAluminium is easily reduced.

BAluminium is not easily oxidized.

CAluminium is easily reduced, but forms a protective coating.

DAluminium is easily oxidized, but forms a protective coating.

2A food can corrodes quickly in sea water while a soft drink can does not. Which of the

following explanations is correct?

AAluminium is more reactive than iron.

BAluminium has a protective oxide layer on its surface.

CAluminium is lighter than iron.

DA food can reacts with sodium chloride while a soft drink can does not.

3The process used to thicken the aluminium oxide layer on aluminium surface is known as

Agalvanization.

Belectroplating.

C anodization.

Dreduction.

4Which of the following statements concerning the anodization of aluminium is INCORRECT?

AAluminium object to be anodized is made the positive electrode.

BThe negative electrode is made of aluminium sheet.

CDilute sulphuric acid is used as an electrolyte.

DOxygen is produced at the negative electrode.

5The experimental set-up of aluminium anodization is shown below.


Electrolyte

Positive electrode

Negative electrode

AMolten aluminium

aluminium object X

aluminium sheet Y

BMolten aluminium

aluminium sheet Y

aluminium object X

CDilute sulphuric acidaluminium object X

aluminium sheet Y

DDilute sulphuric acidaluminium sheet Y

aluminium object X

6Which of the following are the advantages of anodizing aluminium?

(1)It enables aluminium to be dyed readily.

(2)It makes aluminium stronger.

(3)It increases the corrosion resistance of aluminium.

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)

7Which of the following substances are made of anodized aluminium?

(1)Milk bottle caps

(2)Window frames

(3)Bumpers of cars

A(1) and (2) only

B(1) and (3) only

C(2) and (3) only

D(1), (2) and (3)_1217336923.unknown

_1217416458.unknown

_1217336818.unknown

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