Assertion: Zn gives `H_(2)` gas with dil. HCl and also with dil. `H_(2)SO_(4)`.
Reason : In different medium, change in oxidation number shown by mangnese is altogether different.

Options

A. If both assertion and reason are true and the reason is the correct explanation of assertion
B. If both assertion and reason are true and the reason is not the correct explanation of assertion
C. If assertion is false but reason is true
D. If assertion is true but the reason is false

Explanation

To analyze the assertion and reason provided, we will break down the information step by step.

### Step 1: Understanding the Assertion
The assertion states that zinc (Zn) reacts with dilute hydrochloric acid (HCl) and dilute sulfuric acid (H₂SO₄) to produce hydrogen gas (H₂).

- **Reaction with HCl:**
\[ \text{Zn} + 2 \text{HCl} \rightarrow \text{ZnCl}_2 + \text{H}_2 \]
Here, zinc displaces hydrogen from hydrochloric acid, resulting in the formation of zinc chloride and hydrogen gas.

- **Reaction with H₂SO₄:**
\[ \text{Zn} + \text{H}_2\text{SO}_4 \rightarrow \text{ZnSO}_4 + \text{H}_2 \]
Similarly, zinc reacts with sulfuric acid to produce zinc sulfate and hydrogen gas.

**Conclusion for Assertion:** The assertion is true because zinc indeed produces hydrogen gas when reacting with both dilute HCl and dilute H₂SO₄.

### Step 2: Understanding the Reason
The reason states that in different media, the change in oxidation number shown by manganese is altogether different.

- **Manganese in Acidic Medium:**
In an acidic medium, potassium permanganate (KMnO₄) reduces to manganese ions (Mn²⁺):
\[ \text{MnO}_4^- + 8 \text{H}^+ + 5 \text{e}^- \rightarrow \text{Mn}^{2+} + 4 \text{H}_2\text{O} \]
Here, manganese changes from +7 to +2.

- **Manganese in Basic Medium:**
In a basic medium, the same permanganate ion reduces to manganese dioxide (MnO₂):
\[ \text{MnO}_4^- + 2 \text{e}^- + 2 \text{H}_2\text{O} \rightarrow \text{MnO}_2 + 4 \text{OH}^- \]
Here, manganese changes from +7 to +4.

- **Manganese in Neutral Medium:**
In a neutral medium, manganese can also exist in different oxidation states, such as +4 in MnO₂.

**Conclusion for Reason:** The reason is true as manganese shows different oxidation states in different media. However, it does not explain the assertion regarding zinc and hydrogen gas production.

### Final Conclusion
- **Assertion:** True
- **Reason:** True, but not a correct explanation of the assertion.

### Summary
- The assertion is true because zinc reacts with both dilute HCl and H₂SO₄ to produce hydrogen gas.
- The reason is true regarding manganese's oxidation states in different media, but it does not relate to the assertion about zinc.