1

2

3

4) (a) An insoluble salt can be prepared by the precipitation reaction.

Give an example of an insoluble salt and suggest two solutions to prepare the insoluble salt.

Write the ionic equation to represent the precipitation reaction.

[4 marks]

(b) Figure below shows an incomplete flow chart of cation and anion tests for salt X.

Use the reagents listed below to confirm that salt solution of X contains Fe2+ ion and SO42- ions.

[6 marks]

(c) Magnesium sulphate is a soluble salt. Describe how to prepare a dry sample of magnesium

sulphate in the laboratory.

You answer should consist of the following:

Chemical require

Procedure of the preparation

Chemical equation involved in the reaction

[10 marks]

4

REAGENTSSodium hydroxide solutionAmmonia solutionHydrochloric acidBarium chloride solution

5)

5

MARKING SCEME

QUESTION RUBRIC SCORE

1. a) (i) Iron (III) nitrate// Iron (III) ions

(ii) Oxidising agent

(iii) add/pour NaOH or NH3 solution,

Brown precipitate is formed

b) (i) Zn + Cu2+ Zn2+ + Cu

(ii) 0 to +2

(iii) Oxidation

(c) (i) Magnesium/Aluminium

Metal M is higher than zinc in the reativity series//

Metal M is more reactive than zinc

(ii) M, Zn, N

1

1

1

1

1

1

1

1

1

1

Total 10

2 (a) Hydrogenation//addition

(b) (i) Phosphoric acid //H3PO4

(ii) C2H4 + H2O C2H5OH

(iii) Fermentation

(c) (i) Ethanoic acid

(ii) Acidified potassium manganate (VII) solution //

Acidified potassium dichromate (VI) solution.

(d) C2H5OH C2H4 + H2O

(e) (i) Esterification

(ii) sweet smell

(iii)

1

1

1

1

1

1

1

1

1

1

Total 10

3.

CH3

6

7

4.

_____ 20_____

8

5.

5a

5b

9

5c

5d

10

5e

5f

11