JEE Main2017ChemistryHydrogenActual
In which of the following reactions, hydrogen peroxide acts as an oxidizing agent?
Options
- AH O C l + H 2 O 2 → H 3 O + + C l - + O 2
- BI 2 + H 2 O 2 + 2 O H - → 2 I - + 2 H 2 O + O 2
- CP b S + 4 H 2 O 2 → P b S O 4 + 4 H 2 O
- D2 M n O 4 - + 3 H 2 O 2 → 2 M n O 2 + 3 O 2 + 2 H 2 O + 2 O H -
Correct answer
C. P b S + 4 H 2 O 2 → P b S O 4 + 4 H 2 O
Step-by-step solution
The reaction in which H 2 O 2 is getting reduced, it will behave as oxidising agent. 2 e - + 2 H + + H 2 O 2 ⟶ 2 H 2 O       ( r e d u c t i o n ) S - 2 + 4 H 2 O ⟶ S O 4 - 2 + 8 H + + 8 e - ( o x i d a t i o n ) E q u a t i o n .   1 × 4 + E q u a t i o n . 2   F i n a l   r e a c t i o n   P b S + 4 H 2 O 2 ⟶ P b S O 4 + 4 H 2 O