Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?

Options

A. `H_(2)SO_(4)`
B. HCl
C. `HNO_(3)`
D. All of these

Explanation

To solve the question of which acid does not give hydrogen gas when reacting with metals (except Mn and Mg), we can follow these steps:

### Step 1: Understand the General Reaction
Metals typically react with acids to produce a salt and hydrogen gas. The general reaction can be represented as:
\[ \text{Metal} + \text{Acid} \rightarrow \text{Salt} + \text{Hydrogen gas} \]

### Step 2: Identify the Acids
We need to consider the different types of acids that could be involved in this reaction. Common acids include hydrochloric acid (HCl), sulfuric acid (H2SO4), and nitric acid (HNO3).

### Step 3: Analyze the Reaction of Each Acid with Metals
- **Hydrochloric Acid (HCl)**: Reacts with metals to produce hydrogen gas.
- **Sulfuric Acid (H2SO4)**: Reacts with metals to produce hydrogen gas (except when concentrated).
- **Nitric Acid (HNO3)**: Generally does not produce hydrogen gas when reacting with metals due to its strong oxidizing properties.

### Step 4: Focus on Nitric Acid
Nitric acid (HNO3) is a strong oxidizing agent. When it reacts with metals, instead of liberating hydrogen gas, it oxidizes the hydrogen gas that would be produced into water. The reaction can be summarized as:
\[ \text{Metal} + \text{HNO3} \rightarrow \text{Salt} + \text{Water} \]

### Step 5: Conclusion
Based on the analysis, the acid that does not give hydrogen gas on reacting with metals (except Mn and Mg) is nitric acid (HNO3).

### Final Answer
The correct answer is **HNO3 (Nitric Acid)**.

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