Separation of mixtures and purification of chemical substances - Jamb Chemistry Past Questions and Answers

Question 111:

• JAMB 2018

If one of the following oxides is heated with hydrogen or carbon using a bunsen burner. it is not reduced to the metal, Which one is it?

A. Lead oxide
B. Magnesium oxide
C. Copper oxide
D. Tin oxide

Question 112:

• JAMB 2018

The refreshing and characteristic taste of soda water and other soft drinks is as a result of the presence of

A. Carbon(IV)oxide
B. Carbon(ll)oxide
C. Soda
D. Glucose

Question 113:

• JAMB 2018

The presence of ammonia gas in a desiccator can exclusively be removed by

A. Phosphorus (V) oxide
B. Fused calcium chloride
C. Calcium chloride
D. Concentrated tetraoxosulphate (VI) acid

Question 114:

• JAMB 2018

Sieving is a technique used to separate mixtures containing solid particles of

A. Small sizes
B. Large sizes
C. Different sizes
D. The same size

Question 115:

• JAMB 2018

A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by

A. Boiling the water
B. Adding excess calcium hydroxide
C. Adding a calculated amount of calcium hydroxide
D. Adding sodium carbonate