Question

The equivalent weight of Potassium permanganate in acidic medium is:

• A. 31.6
• B. 51.6
• C. 41.6
• D. 21.6

Hint:

To calculate the equivalent weight of a substance, divide its molar mass by the number of electrons involved in the redox reaction. For (\( \text{KMnO}_4 \)), it is 158 g/mol divided by 5 electrons, resulting in 31.6 g/equiv in acidic medium.

Answer 1

The Correct Option is A

In acidic medium, the equivalent weight of Potassium permanganate (\( \text{KMnO}_4 \)) is calculated based on its change in oxidation state. Potassium permanganate undergoes a reduction from +7 to +2 oxidation state, and since 5 electrons are involved, the equivalent weight of \( \text{KMnO}_4 \) is 31.6 g/equiv.