Jamb Chemistry Past Questions and Answers

Question 96:

• JAMB 1978

Three solutions contain carbonate, sulphate and sulphide ions respectively. One test that will identify just ONE of them completely is by addition to each of them of

A. Barium chloride solution
B. Dilute hydrochloric acide
C. Lead nitrate solution
D. Calcium chloride solution
E. Sodium hydroxide solution

Question 97:

• JAMB 1978

Two gas cylinders contain ethylene (ethene) and acetylene respectively. One test which can be used to distinguish between them is by

A. Passing each gas through bromine water
B. Passing each gas through dilute potassium permanganate solution
C. Passing each gas through silver nitrate solution
D. Treating each gas catalytically with excess hydrogen gas

Question 98:

• 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 99:

• 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 100:

• 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