Question

Which of the following reactions of KMnO$_4$ occurs in acidic medium?

• A. Oxidation of thiosulphate to sulphate
• B. Precipitation of sulphur from H$_2$S
• C. Oxidation of iodide to iodate
• D. Oxidation of manganous salt to MnO$_2$

Hint:

KMnO$_4$ in acidic medium is a strong oxidizing agent and is commonly used to oxidize sulfides to elemental sulfur and other oxidation reactions.

Answer 1

The Correct Option is B

Potassium Permanganate Reaction in Acidic Medium

In acidic medium, \( \text{KMnO}_4 \) acts as an oxidizing agent. The reaction of \( \text{KMnO}_4 \) with \( \text{H}_2\text{S} \) leads to the precipitation of sulphur. This reaction occurs in acidic medium, where \( \text{KMnO}_4 \) oxidizes \( \text{H}_2\text{S} \) to sulphur. The other reactions do not occur in acidic medium or are not typical reactions for \( \text{KMnO}_4 \).

Conclusion:

Therefore, the correct answer is Precipitation of sulphur from \( \text{H}_2\text{S} \).