`Zn` gives `H_(2)` gas with `H_(2)SO_(4)` and `HCl` but not with `HNO_(3)` because

Options

A. Zn Acts as oxidising agent when reacts with `HNO_3`
B. `HNO_3` is weaker acid than `H_2SO_4` and HCl
C. Zn is above the hydrogen in electrochemical series .
D. `NO_3^(-)` is reduced in preference to `H^+` ion.

Explanation

To understand why zinc (Zn) reacts with dilute sulfuric acid (H₂SO₄) and hydrochloric acid (HCl) to produce hydrogen gas (H₂), but does not react with nitric acid (HNO₃) to produce hydrogen gas, we can break down the explanation into several steps.

### Step-by-Step Solution:

1. **Understanding Reactivity**:
- Zinc is a metal that is more reactive than hydrogen. In the electrochemical series, metals that are more reactive than hydrogen can displace hydrogen ions (H⁺) from acids, leading to the evolution of hydrogen gas.

2. **Reactions with H₂SO₄ and HCl**:
- When zinc is added to dilute H₂SO₄ or HCl, it reacts as follows:
- For H₂SO₄:
\[ Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2 \uparrow \]
- For HCl:
\[ Zn + 2HCl \rightarrow ZnCl_2 + H_2 \uparrow \]
- In both cases, zinc displaces hydrogen from the acids, resulting in the release of hydrogen gas.

3. **Reaction with HNO₃**:
- When zinc is added to nitric acid (HNO₃), the situation is different. Nitric acid is a strong oxidizing agent, and instead of producing hydrogen gas, it undergoes a reduction reaction. The nitrate ion (NO₃⁻) is reduced preferentially over the hydrogen ions (H⁺).
- The reaction can be represented as:
\[ 2H^+ + NO_3^- + 2e^- \rightarrow NO_2 + H_2O \]
- Here, the nitrate ion is reduced to nitrogen dioxide (NO₂) or other nitrogen oxides, depending on the concentration of nitric acid.

4. **Conclusion**:
- Since the nitrate ion (NO₃⁻) is reduced in preference to hydrogen ions (H⁺), no hydrogen gas is produced when zinc reacts with nitric acid. This is the key reason why Zn does not give H₂ gas with HNO₃.

### Final Answer:
Zinc reacts with dilute H₂SO₄ and HCl to produce hydrogen gas because it displaces hydrogen ions due to its higher reactivity. However, with HNO₃, the nitrate ion is reduced preferentially, preventing the evolution of hydrogen gas.