Question

Given below are the two reactions of $H_{2}O_{2}$. Mark the correct statement which follows.

(i) $2KMnO_{4} + 3H_{2}SO_{4} + 5H_{2}O_{2} \rightarrow K_{2}SO_{4} + 2MnSO_{4}

• 8H_{2}O + 50_{2}$(ii)$2Cr(OH){3} + 4NaOH + 3H{2}O_{2} \rightarrow 2Na_{2}CrO_{4} + 8H_{2}O$

• A. (i) Shows oxidizing nature of $H_{2}O_{2}$and (ii) shows reducing nature of $H_{2}O_{2}$
• B. In (i) $H_{2}O_{2}$acts as a reducing agent and in (ii) it acts as an oxidizing agent.
• C. In both (i) and (ii), $H_{2}O_{2}$acts as an oxidizing agent.
• D. In both (i) and (ii), $H_{2}O_{2}$acts as a reducing agent.

Answer 1

Answer: (B)

In (i) $H_{2}O_{2}$acts as a reducing agent and in (ii) it acts as an oxidizing agent.

Answer 2

: In (i) $H_{2}O_{2}$reduces $KMnO_{4}$to $MnSO_{4}$and is oxidised to $O_{2}$.

In (ii) $H_{2}O_{2}$oxidizes $Cr(OH)_{3}$to $Na_{2}CrO_{4}$and is reduced to $H_{2}O$.