Question

Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final products obtained from it in the three conditions are, respectively.

• A. $MnO_{2},MnO_{2},Mn^{2 +}$
• B. $MnO_{4}^{2 -},Mn^{3 +},Mn^{2 +}$
• C. $MnO_{2},MnO_{4}^{2 -},Mn^{3 +}$
• D. $MnO,MnO_{4},Mn^{2 +}$

Answer 1

Answer: (A)

$MnO_{2},MnO_{2},Mn^{2 +}$

Answer 2

$MnO_{2},MnO_{2},Mn^{2 +}$

In neutral medium:

$2KMnO_{4} + 3MnSO_{4} + 2H_{2}O \rightarrow$

$K_{2}SO_{4} + 2H_{2}SO_{4} + 5MnO_{2}$

In alkaline medium:

$2KMnO_{4} + H_{2}O \rightarrow 2MnO_{2} + 2KOH + 3O$

In acidic medium:

$2KMnO_{4} + 3H_{2}SO_{4} \rightarrow K_{2}SO_{4} + \overset{+ 2}{2MnSO_{4}}$

$+ 5H_{2}O + 5O$