Question

Given below are the two reactions of H₂O₂. Mark the correct statement which follows. 

(i) 2KMnO₄+ 3H₂SO₄ + 5H₂O₂ →K₂SO₄ + 2MnSO₄ + 8H₂O + 5O₂ 

(ii) 2Cr(OH)₃ + 4NaOH + 3H₂O₂ →2Na₂CrO₄ + 8H₂O

a. (i) Shows oxidising nature of H₂O₂ and (ii) shows reducing nature of H₂O₂ 

b. In (i) H₂O₂ acts as a reducing agent and in (ii) it acts an oxidizing agent. 

c. In both (i) and (ii), H₂O₂ acts as an oxidizing agent 

d. In both (i) and (ii), H₂O₂ acts as as a reducing agent.

Answer 1

Correct option  (b) In (i) H₂O₂ acts as a reducing agent and in (ii) it acts an oxidizing agent.

Explanation:

In (i) H₂O₂ reduces KMnO₄ to MnSO₄ and is oxidised to O₂. 

In (ii) H₂O₂ oxidises Cr(OH)₃ to Na₂CrO₄ and is reduced to H₂O.