Oxidation and reduction - Jamb Chemistry Past Questions and Answers

Question 1:

• JAMB 2019

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 2:

• JAMB 2019

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 3:

• JAMB 2019

X is a substance which liberates CO₂ on treatment with concentrated H₂SO₄. A warm solution of X can decolorize acidified KMnO₄. X is

A. HCOOH
B. NaH CO₃
C. FeCO₃
D. H₂C₂O₄

Question 4:

• 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 5:

• 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