Assertion : `KMNO_4` acts as an oxidising agent in acidic, basic or neutral medium.
`KMnO_4` oxidises ferrous sulphate to ferric sulphate.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true and reason not is the correct explanation of assertion.
C. If assertion is trun but reason is false.
D. If both assertion and reason are false.

Answer

To solve the question, we need to analyze the assertion and the reason provided:

**Assertion:** KMnO₄ acts as an oxidizing agent in acidic, basic, or neutral medium.

**Reason:** KMnO₄ oxidizes ferrous sulfate to ferric sulfate.

### Step-by-Step Solution:

1. **Understanding KMnO₄ as an Oxidizing Agent:**
- KMnO₄ (Potassium permanganate) is known for its strong oxidizing properties. It can act as an oxidizing agent in various mediums (acidic, basic, and neutral).
- In acidic medium, it is reduced from Mn(VII) to Mn(II), while oxidizing other substances.

2. **Oxidation of Ferrous Sulfate:**
- Ferrous sulfate (FeSO₄) contains iron in the +2 oxidation state (Fe²⁺).
- When KMnO₄ is added to FeSO₄, it oxidizes Fe²⁺ to Fe³⁺ (ferric sulfate, Fe₂(SO₄)₃), where iron is in the +3 oxidation state.

3. **Chemical Reaction:**
- The balanced chemical equation for the reaction is:
\[ 5 \text{FeSO}_4 + \text{KMnO}_4 + 8 \text{H}_2\text{SO}_4 \rightarrow 5 \text{Fe}_2(SO_4)_3 + \text{MnSO}_4 + 4 \text{K}_2\text{SO}_4 + 8 \text{H}_2\text{O} \]
- This shows that KMnO₄ oxidizes Fe²⁺ to Fe³⁺.

4. **Analyzing the Statements:**
- Both the assertion and the reason are true.
- However, the reason does not explain the assertion adequately. The assertion states that KMnO₄ acts as an oxidizing agent in all mediums, while the reason specifically discusses its reaction with ferrous sulfate.

5. **Conclusion:**
- Since both statements are true but the reason does not correctly explain the assertion, the answer to the question is **B** (Assertion is true, Reason is true, but Reason is not the correct explanation of Assertion).