Question

KMnO₄ can be prepared from K₂MnO₄ as per the reaction,

3MnO₄^2- + 2H₂O ⇋ 2MnO₄^- + MnO₂ + 4OH^- 

The reaction can go to completion by removing OH^- ions by adding

(a) CO₂ 

(b) SO₂ 

(c) HCI 

(d) KOH

Answer 1

The correct option is : (a) CO₂ 

Explanation:

HCl and SO₂ are reducing agents. So they can reduce MnO₄^-.

CO₂ is neither oxidising nor reducing agent, it will provide only acidic medium. It can shift the reaction in forward direction and the reaction can go to completion.