SIMPLE HOLIDAY PACKAGE - Narayana Schools€¦ · SIMPLE HOLIDAY PACKAGE CLASS-Jr_X_(E1 to E3) COLLIGATIVE PROPERTIES 1. ... 12. The elevation in boiling point for one molal solution

26Narayana Group of Schools

CHEMISTRY_SIMPLE HOLIDAY PACKAGEClass - Jr-X_E1-E3

SIMPLE HOLIDAY PACKAGECLASS-Jr_X_(E1 to E3)

COLLIGATIVE PROPERTIES1. The boiling point of 6 6 3 6 5 2C H ,CH OH, C H NH and 6 5 2C H NO are

80 C, 65 C, 184 C and 212 C respectively. Which will show highest vapourpressure at room temperature?

1) 6 6C H 2) 3CH OH 3) 6 5 2C H NH 4) 6 5 2C H NO

2. Which one of the following represents the graph between log P on Y-axis and

1T on X-axis? (P= vapour pressure of a liquid, T= absolute temperature)

1)

y

o x

2)

y

o x

3)

yy

oo xx

4)

y

o x

3. 3 gms of urea is added to 36 gms of boiling water. How much lowering in itsvapour pressure is noticed

1) 19 mm 2)38 mm 3) 760 mm 4) 76 mm

4. The vapour pressure of deliquescent substance is

1) Equal to the atmospheric pressure

2) Equal to that of the water vapour in air

3) Greater than that of the water vapour in air

4) Less that that of the water vapour in air

5. Two liquids X and Y form an ideal solution. At 300K, vapour pressure of thesolutions containing 1 mol of X and 3 mol of Y is 550 mmHg. At the sametemperature, if 1mol of Y is further added to this solution, vapour pressureof the solution increased by 10mmHg. Vapour pressure (in mmHg) of X andY in their pure states will be, respectively:

1) 300 and 400 2) 400 and 600 3) 500 and 600 4) 200 and 300

6. In which case Raoult’s law is not applicable?

1) 1M NaCl 2) 1 M urea 3) 1 M glucose 4) 1 M sucrose



7. A maxima or minima obtained in the temperature composition curve of amixture of two liquids indicates :1) An azeotropic mixture2) An eutectic formation3) That the liquids are immiscible with one another4) That the liquids are partially miscible at the maximum or minimum.

8. If liquids A and B form an ideal solution :1) The free energy of mixing is zero2) The free energy as well as entropy of mixing are zero3) Enthalpy of mixing is zero4) The entropy of mixing is zero

9. Among the following, that does not form an ideal solution is :1) 6 6 6 5 3C H and C H CH 2) 2 5 2 5C H C and C H OH

3) 6 5 6 5C H C and C H Br 4) 2 5 2 5C H Br and C H I10. If the solution boils at a temperature T1 and the solvent at a temperature T2

the elevation of boiling point is given by1) T1 + T2 2) T1 – T2 3) T2 – T1 4) T1 T2

11. Identify elevation in boiling point when 12.5 g of urea is dissolved in 170g of water. Molal elevation constant of water is 0.52 K kg mol–1.1) 0.63 K 2) 0.53 K 3) 0.063 K 4) 0.053 K

12. The elevation in boiling point for one molal solution of a solute in a solvent iscalled :1) Boiling point constant 2) Molal elevation constant3) Cryoscopic constant 4) Osmotic pressure

13. A solution of 2.5 g of a non-volatile solid in 100 g benzene is boiled at 0.42°Chigher than the boiling point of pure benzene. Calculate the molecularmass of the substance. Molal elevation constant of benzene is 2.67 K kg mol–

1.1) 158.9 2) 15.89 3) 1.589 4) 1589

14. The rise in the boiling point of a solution containing 1.8g of glucose in 100gof solvent is 0.10C. The molal elevation constant of the liquid is1) 0.01 K/m 2) 0.1 K/m 3) 1K/m 4) 10 K/m

15. What is the normal b.p of an aquoues solution whose freezing point is02.48 C ?

0 01.86 . / , 0.512 . /f bK C kg mol K C kg mol

1) 0100.7 C 2) 0102.5 C 3) 0109.0 C 4) 099.3 C16. Which one of the following aqueous solutions will have the lowest freezing

point?1) 0.1 molal solution of urea 2) 0.1 molal solution of sucrose3) 0.1 molal solution of sodium chloride4) 0.1 molal solution of calcium chloride

17. A 0.5 molal solution of ethylene glycol in water is used as coolant in a car.If the freezing point constant of water be 1.86 K-kg/mol, the mixture shallfreeze at1) 0.930C 2) - 0.930C 3) 1.860C 4) -1.860C



18. How many moles of sucrose should be dissolved in 500g of water so as t oget a solution which has a difference of 0104 C , between boiling point and

freezing point ? 1 11.86 , 0.52f bK K mol K K mol

1) 1.68 2)3.36 3) 8.40 4) 0.84019. Molal depression of freezine point of water is 01.86 C per 1000 g of water

0.02 mole of urea dissolved in 100 g of water will produce a lowering oftemperature of1) 00.186 C 2) 00.0372 C 3) 01.86 C 4) 03.72 C

20. Find the osmotic pressure of M/20 solution of Urea at 27 0C1) 12.315 atm 2) 1.2315 atm 3) 0.12315 atm 4) 0.0123 atm

21. The relationship between osmotic pressure at 273K when 10g glucose (P1),10g urea (P2), and 10g sucrose (P3) are dissolved in 250 ml of water is1) 1 2 3P P P 2) 3 1 2P P P 3) 2 1 3P P P 4) 2 3 1P P P

22. The osmotic pressure of blood is 7.65 atm at 370c. How much glucose shouldbe used per litre for an intravenous injection that is to have same osmoticpressure as blood1) 5.418 gr / lit 2) 0.27 gr/lit 3) 541 gr/ lit 4) 54.18 gr/ lit

23. 300 3cm of an aqueous solution contains 1.26 g of polymer. The osmotic

pressure of such solution at 300 K is found to be 31.26 10 bar. Calculatethe molar mass of the polymer.1) 83000 2) 63000 3) 53000 4) 43000

24. The osmotic pressure of a solution of anorganic substance containing 18 gm in 1 lit of solution at 293 K is

5 22.414 10 Nm . Find the molecular mass of the substance. (If S= 8.3 J K-1

mole-1)1) 181.33 2) 362.66 3) 36.2 4) 18.1

25. Which of the following salt has the same value of Vant Hoff factor as that of

3 6K Fe CN

1) 2 4Na SO 2) 2 4 3Al SO 3) 3 3Al NO 4) 3 4Fe O26. Which solution will show the maximum vapour pressure at 300 K?

1) 1M NaCl 2) 21M CaCl 3) 31M AlCl 4) 12 22 111M C H O27. In which of the following pairs of solutions will the values of the van’t Hoff

factor be the same?

1) 0.05 M 4 6K Fe CN and 0.10 M 4FeSO

2) 0.20 M NaCl and 0.10 M 2BaCl

3) 0.05 M 4FeSO 4 4 22NH SO .6H O and 0.02 M KCl. 2 2MgCl .6H O4) all have same value

28. A 0.2 molal solution of KCl freezes at 00.68 C . If fK for 2H O is 1.86, thedegree of dissociation of KCl is1)85% 2)65% 3)83% 4)90%

29. The depression in freezing point of 0.01 m aqueous solution of urea, sodiumchloride and sodium sulphate is in the ratio:1) 1:1:1 2) 1:2:3 3) 1:2:4 4) 2:2:3



CHEMICAL KINETICS30. Which of the following is an example for instantaneous reaction?

1) 2 2 22H O 2H O 2) Rusting of iron

3) H2 5 3 3 2 5 2C H OH CH COOH CH COOC H H O

4) (aq ) (aq ) (aq) 2HCl NaOH NaCl H O

31. For 2 2 2N O NO rate =

1) 2[ ]d Ndt

2) 2[ ]d O

dt

3) 12

[ ]d NOdt 4) All the above

32. The rate for the reaction 2A B is:

1) A1

2 t

2) Bt

3) Both 1 & 2 4) B1

2 t

33. Select the right graph between concentration and time as a reaction proceeds.

1) 2)

3) 4) Both 1 and 2

34. For the reaction 2NO22NO+O2 which of the following is false ?1)The decrease in [NO2] and the increase in [NO] proceed at the same rate2) The rate of formation of NO is twice the rate of formation of O23)The average rates of increase in the concentration of NO and O2 are

expressed as NOdtd

and 2Odtd

4) dt)O(d2

dt)NO(d 2

35. Which of the following reactions is faster?

A : 2NaCl+ H2SO4 Na2SO4+ 2HCl

B : CH4+ 2O2 CO2+ 2H2O1) Reaction A 2) Reaction B 3) Same in both the cases 4) None

36. In genral, with every 10°C rise in temperature, the rate of reaction becomesapproximately1) ten times 2) double 3) Half 4) One tenth



37. The relation between the rate of a simple reaction and the concentration 'c'of the reacting species is given as

1) rate c 2) 1

ratec

3) 1

nratec 4) ncrate (n=order of reaction)

38. A chemical reaction was carried out of 300 K and 280 K. The rate constantswere found to be 1K and 2K respectively. then

1) 2 14K K 2) 2 12K K 3) 2 10.25K K 4) 2 10.5K K

39. AT 300 K rate constant for A products at t = 50 min is 10.02 s , then rate

constant at t = 75 min and 310 k will be (in 1s )

1) 0.0425 2) 0.04 25 3) 0.04 4)

0.0225

40. The relation between the rate of a simple reaction and theconcentration 'c'of the reacting species is given as

1) Rate c 2) 1Ratec

3) n

1Ratec

4) nRate c (n=order of reaction)

41. The reaction

NaOHHCOOCCH 523

OHHCCOONaCH 523 is allowed to take place with initial concentrations of 0.2 mole/lit of eachreactant. If the reaction mixture is diluted with water so that the initialconcentration of each reactant becomes 0.1 mole/lit, the rate of the reactionwill be1) 1/8 th of the original rate 2) 1/4 th of the original rate3) 1/2 th of the original rate 4) same as the original rate

42. The rate expression for the reaction ( ) ( ) ( )g g gA B C is rate 2 1/ 2A BKC C . What

changes in the initial cocentations of A and B will cause the rate of reactionto increase by a factor of eight?

1) 2; 2A BC C 2) 2; 4A BC C 3) 1; 4A BC C 4) 4; 1A BC C 43. For the reaction 2 3A B product, A is in excess and on changing the

concentration of B from 0.1 M to 0.4 M, rate becomes doubled. Thus, ratelaw is:

1) 2 3dx k A Bdt

2) dx k A Bdt

3) 0 2dx k A Bdt

4) 12

dx k Bdt

44. For the hypothetical reaction 2A+3Bproducts, the rate with respect to Ais r1 and the rate with respect to B is r2 these are related as

1) 21 rr 2) 21 32 rr 3) 21 23 rr 4) 32

21 rr



45. If a reaction obeys the following equation xaa

tk

log303.2

then the order

is1) 0 2) 1 3) 2 4) 3

46. Rate equation for a second order is

1) K2.303 alog

t a x

2) K

1 alogt a x

3) K1 Xt a(a x)

4) 2K

1 a(a x)t

47. Which represents the time to complete 90% of first order reaction

1) 34log

303.2k

2) 43log303.2

k 3) k303.2

4) 3log303.2k

48. Which of the following represents the expression for 3/4th life of1st orderreaction

1) 2.303 log 3/ 4

k 2) 2.303 log 3

k 3) 2.303 log 4

k 4) log 42.303

K

49. Which of the following curves represents a 1st order reaction?

1)t1/2

a

2)t1/2

a

3)t1/2

a

4) t1/2

a50. Which curve represents zero order reaction

1)C

t

2)C

t

3)C

t

4) C

t51. Which is not the graphical representation for the zeroth order reaction

1)

time

dxdt 2)

time

x 3)

time

dxdt 4)

45°

log t

log

x

52. In a first order reaction when alog

a x

is plotted against time the graph

obtained is1) A straight line with a negative slope

2) A straight line whose slope is k

2.303

3) A straight line whose slope is k

2.303

4) An asymptotic curve



53. A chemical reaction A+2BAB2 follows in two stepsA+BAB(slow)AB+BAB2(fast)Then the order of the reaction is1) 3 2) 2 3) 1 4) 0

54 The rate experssion for a chemical reaction2NO2F 2NO2+F2 is given by rate =K[NO2F]The rate determining step may be1) 2NOF22NO2+F2 2) NO2F +FNO2+F2

3) NO2F NO2+F 4) NO2+FNO2F

55. The hypothetical reaction. 2 2A + B 2AB follows the following mechanism:

2A A + A (fast)

2A + B AB + B (slow)

A +B AB (fast)The order of the overall reaction is:1) zero 2) 1 3) 2 4) 3/2

56. The chemical reaction 3 22O 3O proceeds as follows

3 2O O O (fast)

3 2O O 2O (slow)The rate law expression should be

1) r = 23K O 2) r = 123 2K O O 3) r = 3 2K O O 4) 23 2K O O

57. For a reversible reaction A B , which one of the following statements iswrong from the given energy profile diagram

ABE

Reaction coordinate1) Activation energy of forward reaction is greater than backward reaction2) The forward reaction is endothermic3) The threshold energy is less than that of activation energy4)The energy of activation of forward reaction is equal to the sum of heat ofreaction and the energy of activation of backward reaction.

58. Consider the energy profile, for the reaction X Y R S which of thefollowing deduction about reaction is not correct?

80

60

4020

R S

x y

1) The energy of activation for the B.R is 80 KJ2) The F.R is Endothermic3) H for the forward reaction is 20 kJ4) The energy of activation for F.R is 60 kJ



59. The following figure denotes the energy diagram for a reaction

Reaction coordinate

Reactants

Ene

rgy

Products Then the A.E of the reverse reaction is

1) 2x 2) 2y 3) x y 4) y x60. The energy profile diagrams of two reactions are shown in the figure. Then

A

B

C

D

ener

gy

Reaction coordinates1)reaction AB is faster than and more exothermic than reaction CD2) reaction CD is faster than reaction AB but less exothermic3) reaction CD is faster and more exothermic than the reaction A B.4)reaction C D 2

12 times faster than reaction A B at the sametemperature

ACIDS, BASES AND SALTS61. In the reaction 3 2 4NH H O NH OH, the conjugate acid-base pair is

1) 3 2NH and H O 2) NH3 and OH- 3) 2 4H O and NH 4) 4 3NH and NH

62. Which of the following is cationic Bronsted acid?

1) 2 5N H 2) 2 3Cu H O OH

3) 4HSO 4) cl

63. The following has no conjugate base

1) 2 4H PO 2) 2 2H PO 3) 2 3H PO 4) CH3COOH

64. Which of the following is a Lewis acid but not a Bronsted acid?

1) 4HSO 2) BCl3 3) NH3 4) HNO3

65. In the reaction SnCl2 + 2Cl- SnCl4 +2e- the Lewis acid is

1) SnCl 2) SnCl3 3) SnCl2 4) 4SnCl66. At any temperature, the proton concentration of water is

1) 1410 M 2) Kw 3) > 710 M 4) wK

67. At 700C the concentration of H+ ion in aqueous solution of NaCl is 10-6

mole/lit. The OH- ion concentration is1) 10-8 moles/lit. 2) 10-6moles/lit. 3) 10-7 moles/lit. 4) 10-9moles/lit.

68. pH of a sample of KOH and another of NaOH are 10 and 12 respectively.

Their normalities are related as NaOH KOHN xN . What is the value of x?

1) 5/6 2) 6/5 3) 210 4) 210



69. Aqueous solution of which of the following shows lower HP ?

1) 3KNO 2) 2ZnCl 3) 3CH COONa 4) 3 4CH COONH70. For a dibasic acid,

2 1( )H A HA H K 2

2( )HA A H K 2

2 2 ( )H A H A K then

1) 1 2K K K 2) 1 2K K K 3) 1 2/K K K 4) 1 2.K K K

71. Degree of dissociation of CH3COOH and 4NH OH are the same. If 0.01 Msolution of CH3COOH has pH=4.0; then pH of 0.01 M NH4OH will be1) 4 2) 7 3) 10 4)14

72. A monobasic acid solution has pH value of 5. Its molarity is 0.005M. Thedegree of ionisation of the acid is1) 5 x 10-3 2) 2x10-3 3) 5 x10-2 4) 2x10-2

73. Determine the degree of ionisation of0.05M NH3 at 250C in a solution of pH=11(Kb=1.76 x 10-5)1) 0.0173 2) 0.173 3) 1.73 4) 17.3

74. Buffer capacity of acid buffer solution is more when1) pKa = pH 2) [Salt] = [Acid] 3) pKa = 7 4) [H+] = pKa

75. The pH of basic buffer mixture is given by :

1) Hbp pK log salt / Base 2) bKH OHp p p log salt / Base

3) bKHp 14 p log salt / Base 4) bKHp 14 p log salt / Base

76. To obtain a buffer which should be suitable for maintaining a pH of about 4-5,we need to have in solution, a mixture of :1) A strong base + its salt with a weak acid2) A weak base + its salt with a strong acid3) A strong acid + its salt with a weak base4) A weak acid + its salt with a strong base

77. What is the pH of the buffer solution containing 0.15 mole of 4NH OH and

0.25 mole of 4NH C ?l Kb for 4NH OH is : 1.98 × 10–5 :

1) 10 2) 9 3) 9.2 4) 10.278. MX is the salt of weak base, MOH and weak acid, HX . Aqueous solution of

MX is1) Acidic, if a bK K 2) Basic, if a bK K3) Neutral, if a bK K 4) All the above

79. The HP of 0.1M solution of the following compounds increase in the order

1) 4NaCl NH Cl NaCN HCl 2) 4HCl NH Cl NaCl NaCN

3) 4NH NaCNNaCN NaCl Cl 4) 4NaCN NH Cl NaCl HCl

80. hK of salt obtained from strong acid and weak base is 52 10 . The bK of weakbase is

1) 192 10 2) 105 10 3) 102 10 4) 95 10



81. pH of 0.01M HS- will be

1) log7

2apK CpH

2) log7

2apK CpH

3) 1 272

pK pKpH 4) 7

2a bpK pKpH

82. The pH range of phenopthaline indicator?1) 3.1 to 4.4 2) 8.3 to 10 3) 6.8 to 8.4 4) 1 to 2

83. The HP range of phenolphathalein indicator is 8.3 to 10.0. Its KInP , Colour inacidic medium and colour in basic medium are1) 7.8, Colourless , Pink 2) 9.7, Pink, colour less, pink3) 9.1, Colourless, pink 4) 10.4, pink, Colour less

84. Phenolphthalein is a :1) Weak organic acid 2) Weak organic base3) Strong inorganic acid 4) Strong inorganic base

85. When 20 mL of M/20 NaOH is added o 10 mL of M/10 HCl, the resultingsolution will1) Turn blue litmus red2) turn phenolpthalein solution pink3) Turns methyl orange red4) Will have no effect on either red or blue litmus

86. Suitable indicator in the titration of NaOH and CH3COOH is1) Methyl orange 2) Methyl red3) Phenolphthalein 4) Bromothymol blue

87. For the electrolyte of type, 2 , spA B K is given then its solubility is calculatedby

1) / 4spK 2) 3

4spK

3) 3spK 4)

4spK

88. The solubility of calcium fluoride in saturated solution, if its solubility productis 113.2 10 , is:1) 42.0 10 M 2) 312.0 10 M 3) 40.2 10 M

4) 32.0 10 M89. The solubility product of magnesium phospate is given as

1) 32

sp 4K Mg PO 2) 332

sp 4K Mg PO

3) 23 32

sp 4K Mg PO 4)

2 34

sp3 4 2

Mg POK

Mg PO

90. In which of the following, the solubility of AgCl will be maximum ?

1) 30.1 M AgNO 2) Water 3) 0.1 M NaCl 4) 0.1 M NaBr

91. Why only 3As gets precipitated as 2 3As S and not 2Zn as ZnS when 2H S ispassed through an acidic solution containing 3As and 2Zn ?

1) Solubility product of 2 3As S is less than that of ZnS2) Enough 3As are present in acidic medium3) Zinc salt does not ionise in acidic medium4) Solubility product changes in presence of an acid



THERMOCHEMISTRY92. Which of the following is an endothermic reaction

1) 2 2 3N (g) 3H (g) 92kJ 2NH (g) 2) 2 2N (g) O (g) 180.8kJ 2NO(g)

3) 2 2H (g) Cl (g) 2HCl(g) 184.6kJ 4) (graphite ) 2 4C 2H (g) CH (g) 74.8kJ 93. Which one of the following is an endothermic reaction?

1) 5 3 2PCl g PCl g Cl g 2) 2 2 32SO g O g 2SO g

3) 2 4C graphite 2H g CH g 4) 2aq aq aqHCl NaOH NaCl H O

94. The relationship between H and E for the reaction gPClgClgPCl 523 is given as

1) RTEH 2) RTEH 3) RT2EH 4) RT2EH 95. For the reaction 2 2 3N 3H 2NH

1) RT2EH 2) RT2EH 3) RTEH 4) RTEH 96. For the reaction 2 4 2 2 2C H g 3O g 2CO g 2H O l ; E 1415KJ . The

H at 270C is1) –1410 KJ 2) –1420 KJ 3) +1420 KJ 4) +1410 KJ

97. The enthalpy changes for the followingprocesses are listed below

2 2 ;242.3Cl g Cl g Kjmol 2 2 ;151.0I g I g KJmol

;211.3ICl g I g Cl g KJmol 2 2 ;62.76I s I g KJmol

Given that the standard states for iodine and chlorine are 2 2I s and Cl g ,

the standard enthalpy for ICl g is :

1) 14.6KJmol 2) 16.8KJmol 3) 16.8KJmol 4) 244.8KJmol

98. 2 33 22

S O SO x KJ ; 2 2 312

SO O SO y KJ The heat of formation of 2SOis1) y - 2x 2) 2x + y 3) x + y 4) 2x/y

99. The heat evolved during the formation of 24.95 grams of hydrated coppersulphate from anhydrous copper sulphate (mol.wt=159.5) is

4 2 4 25 .5CuSO H O CuSO H O 78.2H KJ

1) -78.21 KJ 2) 78.21 KJ 3) 7.82 KJ 4) -7.82 KJ100. The 0

fH for CO2 (g), CO (g) and H2O (l) are -393.5, -110.5 and -241.8 KJ.mol-1 respectively. The standard enthalpy change ( in KJ) for the reaction

2 2 2CO g H g CO g H O l is1) 524.1 2) 41.2 3) -262.5 4) -41.2

101. If 2H OH H O. H 57.3KJ , then the heat of neutralisation forcomplete neutralisation of 1 mole H2SO4 by a base is1) –57.3 KJ 2) –114.6 KJ 3) –28.65 KJ 4) –14.3 KJ

102. If 3 3 2 1 2 2CH COOH OH CH COO H O q H OH H O q then the

enthalpy change for the reaction 3 3CH COOH CH COO H is equal to

1) 1 2q q 2) 1 2q q 3) 2 1q q 4) 1 2q q



103. The heat of neutralisation of a strong acid by a strong base is 57.3 KJ mol-1.The heat released when 0.5 mol HNO3 is mixed with 0.2 mol KOH in aqueousmedium is

1) 57.3 KJ 2) 11.46 KJ 3) 28.65 KJ 4) 40.11 KJ

104. Given the bond energies of N N , H – H and N – H bonds are 945, 436 KJ/mole and 391 KJ/mole respectively. The enthalpy of the reaction;

2 2 3N g 3H g 2NH g is

1) –93 KJ 2) –102 KJ 3) 93 KJ 4) 102 KJ

105. 500 ml of 1 M HCN is neutralised completely by 500 ml of 1 M KOH solutionand 1.36 K.cal of heat is liberated. The H of dissociation of HCN is

1) 10.98 K.cal/mol 2) -10.98 K.cal

3) 12.305 K.cal/mol 4) 8.12 K.cal/mol

106. Given that .KJ25.35ZnOO21Zn 2 .KJ11.9O

21HgHgO 2 The heat of

the reaction HgZnOHgOZn is

1) -26.14 KJ 2) 44.39 KJ 3) -44.39 KJ 4) 26.14 KJ

107. 2 2 2 , 44 .H g Cl g HCl g H K cals 22 2 2 ,Na s HCl g NaCl s H g

cal.K152H 21 , ?2

Na s Cl g NaCl s H

1) +108 K.cal 2) -196 K.cal 3) -98 K.cal 4) 50 K.cal

108. If 1 , 207.6 S g e S g H KJ .KJ2.335H,gSe2gS 2

The enthalpy for the reaction :gSegS 21

1) +127.6 KJ 2) -127.6 KJ 3) +542.8 KJ 4) -641.8 KJ

109. AT 298 K, the heat of solution of MgSO4 (s) is -91.21 KJ mol-1 and that ofMgSO4. 7 H2O (s) is 13.81 KJ mol-1. Calculate heat of hydration of MgSO4 (s)i.e., H for the reaction

sOH7.MgSOlOH7sMgSO 2424

1) -105.02 KJ mol-12) 105.02 KJ mol-1 3) -77.40 KJ mol-1 4) 77.40 KJ mol-1

110. Three statements are given below

i) The amount of heat evolved when 500 ml of 1 M 2 4H SO is mixed with 250ml of 1 M NaOH solution is -28.65 k.j

ii) The amount heat evolved when 1 litre of 1 M 3CH COOH is neutralised



with l litre of 1 M NaOH solution -13.3k.cals. The heat of dissociation ofacetic acid is 0.4 .k cal

iii) The standard heat of combustion of graphite is equal to standard heat of formation of 2CO

1. all are correct 2. i and ii are correct

3. i,ii and iii are correct 4. ii and iii are correct

ELECTRO CHEMISTRY111. If mercury is used as cathode in the electrolysis of NaCl solution, the ions

discharged at cathode are

1) H+ 2) Na+ 3) OH– 4) Cl–

112. The reaction taking place at the anode when a dilute aqueous solution ofCu SO4 is electrolysed using inert Pt electrodes.

1) 2SO 24 S2O 2

4 + 2e– 2) Cu2+ + 2e– Cu

3) 2H2O O2 + 4H+ + 4e– 4) 2H+ + 2e– H2

113. The passage of current through a solution of certain electrolyte results inthe formation of hydrogen at anode the solution is

1) Aqueous HCl 2) Fused CaH2

3) sulphuric acid in water 4) Aqueous K2SO4

114. The number of electrons needed to reduce 3gm of Mg2+ to Mg are

1) N 2) 2N 3)

4N

4) 8N

115. The electrochemical equivalent of a metal is “x” gm. coulomb–1. Theequivalent weight of metal is

1) x 2) x × 96500 3) x/96500 4) 1.6 × 10–19 × x

116. The charge required to reduce 1mole Cr2O2

7 to Cr+3 ions is

1) 3F 2) 3 coulomb 3) 6F 4) 2x6.023x1023e–

117. Conductance unit Siemen’s (S) is directly proportional to area of the vesseland the concentration of the solution in it and is inversely proportional tothe length of the vessel, then the unit of constant of proportionality is

1) 1S m mol 2) 2 1S m mol 3) 2 2S m mol 4) 2 2 2S m mol

118. The equivalent conductance at infinite dilution of a weak acid such as HF

1) Can be determined by extrapolation of measurements on dilute solutionsof HCl, HBr and HI



2) Can be determined by measurement on very dilute HF solutions

3) Can be best determined from measurements on dilute solutions of NaF,NaCl and HCl

4) is an undefined quantity

119. Which of the following statements is correct for an electrolytic solutionupon dilution

1) conductivity increases

2) conductivity decreases

3) molar conductance decreases but equivalent conductance increases

4) molar conductance increases while equivalent conductance decreases.

120. The correct order of equivalent conductance at infinite dilution of LiCl, NaCland KCl is

1) LiCl>NaCl>KCl 2) KCl>NaCl>LiCl 3) NaCl>KCl>LiCl 4) LiCl>KCl>NaCl

GENERAL ORGANIC CHEMISTRY (PART-1)121. Which of the following is/are aromatic heterocyclic compound(s)?

1) Quinoline 2) Pyridine 3) Thiophene 4) All of these

122 Which of the following is an aromatic compound?

1) Benzene 2) Naphthalene 3) Furan 4) All of these

123. Which of the following properties is not true regarding organic compounds?

1) They are generally covalent compounds

2) They have high melting and boiling points

3) They are generally insoluble in water

4) They usually show isomerism.

124. I.U.P.A.C name of neo-pentane is

1) 2- ethyl pentane 2) 2, 2- di methyl pentane

3) 2, 2- di methyl propane 4) 2- methyl propane

125. Which of the following statement is correct?

1) The IUPAC name of alkenes ends with suffix -ene

2) The IUPAC name of alkynes ends with suffix -yne

3) The IUPAC name of alkanes ends with suffix -ane

4) All of these


CHEMISTRY_SIMPLE HOLIDAY PACKAGEClass - Jr-X_E1-E3126. The correct IUPAC name of the following structure

3 3CH - CH- CH - CH

Cl Br

is:

1) 2 - bromo 3-chloro butane 2) 3 - chloro 2-bromo butane3) 3 - chloro 2-bromo butane 4) None of these

127. IUPAC name of 3 2 2 5

3 2 5

2 2 3

H C||

|

C H

CH -CH -CH

CH - CH - - - C HCHC is:

1) 3, ethyl 4-methyl pentane 2) 3, 4 - diethyl-4-methyl heptane

3) 3-methyl, 4, 5 diethyl Hexane 4) None of these

128. Which of the following structure is 2, 2, 5-trimethyl heptane?

1) 3 2 2 2 33

3

|CH C CH CH CH CH CH

CH2) 3 2 2 2 33

CH C CH CH CH CH CH

3) 3 2 2 33 | |

3 3CH CHCH C CH CH CH CH CH 4) 3 2 2 2 33 |

3CH

CH C CH CH CH CH CH

129.

O

C group is present in

1) ketones only 2) aldehydes only

3) Carboxylic acid only 4) All the above

130. The suffixes for alcohols, aldehydes and ketones, according to IUPAC systemare respectively

1) -ane , - al - keto 2) -ol -al - keto

3) -al , - ol, - one 4) -ol, -al , -one

131. The functional group present in acylchlorides is

1) Cl 2) ||OC Cl

3) ||OC OCl

4) 2CH OCl

132. Acetophenone is

1)

O Me

2)

O Ph

3)

COOH

4)

OC H2 5



133. Benzophenone is

1)

O Me

2)

O Ph

3)

COOH

4)

OC H2 5

134. IUPAC name of is

1) Dibenzene 2) Naphthalene 3) Anthracene 4) Both 1 and 2

135. 7 9C H N has how many isomeric forms that contain a benzene ring

1) 4 2) 5 3) 6 4) 7

136. Maximum enolisation takes place in

1) CH3COCH3 2) CH2COCH2CHO

3) CH3COCH2COCH3 4) O

137. Tautomerism is not exhibited by

1) OO 2) N OH

3) O

O

O

4) O

138. Which of the following are chain isomers?

1) CH3CH2CH3 and CH3CH2CH2 CH3 2) CH3CHCl2 and CH2Cl CH2Cl

3) CH3CH2CH2OH and CH3CH2OH 4) CH3CH2CH2 CH3 and (CH3)2CHCH3

139. The geometrical isomerism is shown by:

1)

2CH

Me

2)

2CH

Me3)

CHCl

Me4)

CHCl

Me

140. The total number of geometrical isomers possible in following compound is

Ph HC HC- = 3CH CH CH= -

1) 2 2) 1 3) 6 4) 8



141. Which will show geometrical isomerism

1)

3CHCH

3CH2)

3CHCH

3)

3CHCH

3CH4) Both 1 & 3

GENERAL ORGANIC CHEMISTRY PART-II142. The compound which gives the most stable carbonium ion on dehydration

1) 3 2

3

CH CH CH OH|CH

2)

3

3

3

CH|

H C C OH|CH

3) 3 2 2 2CH CH CH CH OH 4) 3 2 3CH CH CH CH

|OH

143. Zero inductive effect is exerted by

1) 6 5C H 2) -H 3) 3CH 4)-Cl

144. The correct stability order for the following species is

1) II > IV > I > III 2) I > II > III > IV 3) II > I > IV > III 4) I > III > II > IV

145. I)

2NH

II)

2NH

3CH

III)

2NH

2NO

Correct order of basic strength is

1) II > I > III 2) I > II > III 3) III > II > I 4) II > III > I



146. The most unlikely representation of resonance structrues of p-nitrophenoxideion is

1) 2) 3) 4)

147. Which is not the resonance structure of a carbocation?

1) 2) 3) 4)

148. Which of the following is not an aromatic compound

1) 2) O

O

3) N

H

4) N

H

149. Among the following which is a non planar compound

1) 2) 3) H H 4)

150. Give the decreasing order of hyperconjugative effect of R in R – CH = CH2,where R is

I) Me– II) Et– III) Me2CH– IV) Me3C–

1) I>II>III>IV 2) IV>III>II>I 3) II>I>III>IV 4) IV>III>I>II

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SIMPLE HOLIDAY PACKAGE - Narayana Schools€¦ · SIMPLE HOLIDAY PACKAGE CLASS-Jr_X_(E1 to E3) COLLIGATIVE PROPERTIES 1. ... 12. The elevation in boiling point for one molal solution