Which gas is evolved when `PbO_(2)` is treated with conc. `HNO_(3)` ?

Options

A. `NO`
B. `O_(2)`
C. `N_(2)`
D. `N_(2)O`

Explanation

To determine the gas evolved when lead dioxide (PbO₂) is treated with concentrated nitric acid (HNO₃), we can follow these steps:

### Step 1: Write the reaction equation
When lead dioxide reacts with concentrated nitric acid, it forms lead nitrate and releases gases. The general reaction can be represented as:

\[ \text{PbO}_2 + \text{HNO}_3 \rightarrow \text{Pb(NO}_3\text{)}_2 + \text{O}_2 + \text{NO}_2 + \text{H}_2\text{O} \]

### Step 2: Identify the products
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