Manganese salt `+ PbO_(2) + conc. HNO_(2) rarr ` The solution has purple colour
The colour is due to

Options

A. `HMnO_(4)`
B. A lead salt
C. `Mn(NO_(3))_(2)`
D. `H_(2)MnO_(4)`

Explanation

To solve the question regarding the purple color observed when manganese salt reacts with PbO2 and concentrated HNO3, we can break down the process step by step.

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants are manganese salt (commonly manganese nitrate, Mn(NO3)2), lead oxide (PbO2), and concentrated nitric acid (HNO3).

2. **Understand the Reaction**:
- When manganese salt reacts with lead oxide and concentrated nitric acid, a complex reaction occurs. The manganese salt undergoes oxidation and interacts with the nitric acid.

3. **Formation of Permanganic Acid**:
- The key product formed in this reaction is permanganic acid (HMnO4). This acid is known for its distinct purple color.

4. **Balanced Chemical Equation**:
- The balanced equation for the reaction can be represented as:
\[ 2 \text{Mn(NO}_3\text{)}_2 + 5 \text{PbO}_2 + 6 \text{HNO}_3 \rightarrow 2 \text{HMnO}_4 + 5 \text{Pb(NO}_3\text{)}_2 + 2 \text{H}_2\text{O} \]
- This equation shows that manganese nitrate reacts with lead oxide and nitric acid to produce permanganic acid, lead nitrate, and water.

5. **Color Identification**:
- The purple color observed in the solution is due to the formation of permanganic acid (HMnO4), which is purple in color.

6. **Conclusion**:
- Therefore, the color observed in the solution is due to the presence of permanganic acid (HMnO4).

### Final Answer:
The purple color is due to the formation of **HMnO4 (permanganic acid)**.

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