Chemistry 1978 Jamb Past Questions and Answers

Question 36 :

• JAMB 1978

Consider the following equation H₂O + 2Fe²⁺ + Cl₂ ↔ 2Fe³⁺ + 2Cl^- + H₂O. The only ion which behaves as an oxidising agent is

A. Fe²⁺
B. Cl₂
C. Fe³⁺
D. Cl^-
E. H₂O

Question 37 :

• JAMB 1978

If hydrogen sulphide gas is passed into a solution of a pure iron chloride, a yellow deposit appears. If the deposit is filtered, a pale green solution is left behind. The pale green solution is

A. Dilute sulphuric acid
B. Dilute hydrochloric acid
C. Unreacted hydrogen sulphide in water
D. Iron (III) chloride
E. Iron (II) chloride

Question 38 :

• JAMB 1978

Which of the following changes is physical?

A. Adding iron filing to aerated water
B. Adding sodium metal to water
C. Cooling a solution of Iron (II) sulphate to obtain the hydrated salt
D. Cooling water to obtain ice
E. Burning the domestic gas (Utilgas) for cooking

Question 39 :

• JAMB 1978

By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and

A. Potassium nitrate
B. Sand
C. Lead nitrate
D. Sugar (glucose)
E. Starch

Question 40 :

• JAMB 1978

In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base?

A. In the beaker
B. In the conical flask
C. In a burette
D. In the standard flask
E. In the measuring cylinder