Generally no hydrogen gas is evolved when metal reacts with dilute nitric acid. Select the statement with correct explanation.

Options

A. Nitric acid is a strong reducing agent
B. Nitric acid is a strong oxidising agent oxidises hydrogen into water and itself get reduced to Oxide of Nitrogen
C. `NH_3` gas is evolved instead
D. Nitric acid is a strong oxidising agent oxidises hydrogen into w get reduced HCL.

Explanation

### Step-by-Step Solution:

1. **Understanding the Reaction**: When a metal reacts with dilute nitric acid (HNO3), we generally expect hydrogen gas (H2) to be produced. However, in this case, hydrogen gas is not evolved.

2. **Identifying the Role of Nitric Acid**: Dilute nitric acid is known to be a strong oxidizing agent. This means that it has the ability to oxidize other substances while itself getting reduced.

3. **Analyzing the Reaction with Zinc (Zn)**: Let's consider zinc (Zn) as the metal reacting with dilute nitric acid. The expected reaction would be:
\[ \text{Zn} + \text{HNO}_3 \rightarrow \text{Zn(NO}_3)_2 + \text{H}_2 \]
However, instead of producing hydrogen gas, the nitric acid oxidizes the hydrogen produced.

4. **Oxidation of Hydrogen**: The oxidizing agent (HNO3) reacts with the hydrogen gas (H2) that would have been produced. The reaction can be represented as:
\[ \text{HNO}_3 + \text{H}_2 \rightarrow \text{H}_2\text{O} + \text{NO} \text{ (or other nitrogen oxides)} \]
Here, hydrogen is oxidized to water (H2O), while the nitrogen in nitric acid is reduced from an oxidation state of +5 to a lower oxidation state (like +2 in NO or +4 in NO2).

5. **Conclusion**: Therefore, the reason no hydrogen gas is evolved when metals react with dilute nitric acid is that nitric acid oxidizes the hydrogen gas to water, and itself gets reduced to an oxide of nitrogen.

6. **Selecting the Correct Statement**: The correct explanation for the observation is that nitric acid is a strong oxidizing agent, which oxidizes hydrogen into water and reduces itself to an oxide of nitrogen.

### Final Answer:
The correct statement is: "Nitric acid is a strong oxidizing agent. It oxidizes hydrogen into water and itself gets reduced to an oxide of nitrogen."

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