Question

In basic medium, H₂O₂ exhibits which of the following reactions ?

(A) Mn²⁺ → Mn⁴⁺

(B) I₂ → I^– 

(C) PbS → PbSO₄

Choose the most appropriate answer from the options given below :

(1) (A), (C) only 

(2) (A) only 

(3) (B) only 

(4) (A), (B) only

Answer 1

(4) (A), (B) only

In basic medium, oxidising action of H₂O₂ .

Mn²⁺ + H₂O₂ → Mn⁺⁴ + 2OH^–

In basic medium, reducing action of H₂O₂

I₂ + H₂O₂ + 2OH^–→ 2I^– + 2H₂O + O₂

In acidic medium, oxidising action of H₂O₂ .

PbS(s) + 4H₂O₂ (aq) → PbSO₄ (s) + 4H₂O(l)

Hence correct option (4)