An explosion takes place when conc. `H_2SO_4` is added to `KMnO_4`. Which of the following is formed?

Options

A. `Mn^2O_7`
B. `MnO_2`
C. `MnSO_4`
D. `Mn_2O_3`

Explanation

To solve the question regarding the reaction between concentrated sulfuric acid (H₂SO₄) and potassium permanganate (KMnO₄), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
The reactants in this reaction are concentrated sulfuric acid (H₂SO₄) and potassium permanganate (KMnO₄).

2. **Understand the Reaction**:
When concentrated sulfuric acid is added to potassium permanganate, a redox reaction occurs. The manganese in KMnO₄ is in the +7 oxidation state.

3. **Write the Reaction**:
The balanced chemical equation for the reaction can be written as follows:
\[ 2 KMnO_4 + 3 H_2SO_4 \rightarrow K_2SO_4 + 2 Mn_2O_7 + 3 H_2O \]
Here, potassium sulfate (K₂SO₄), manganese(VII) oxide (Mn₂O₇), and water (H₂O) are formed.

4. **Identify the Product of Interest**:
Among the products formed, we need to identify which one corresponds to the options given in the question. The key product formed is manganese(VII) oxide, which is Mn₂O₇.

5. **Check the Options**:
The options provided are:
- Mn₂O₇
- MnO₂
- MnSO₄
- Mn₂O₃

From the balanced equation, we can see that Mn₂O₇ is indeed formed.

6. **Conclusion**:
Therefore, the product formed when concentrated sulfuric acid is added to potassium permanganate is Mn₂O₇.

### Final Answer:
The correct answer is **Mn₂O₇**.