Assertion: In electrolysis of aqueous NaCl the product obtained is not `H_2` gas.
Reason: Generally gases are liberated faster than the metals.

Options

A. Assertion and Reason both are correct statements and reason is the correct explanation of the assertion.
B. Assertion and Reason both are correct statements, but reason is not the correct explanation of the assertion.
C. Assertion is true, but reason is false.
D. Assertion is false, but reason is true.

Explanation

To solve the question, we need to analyze the assertion and reason provided regarding the electrolysis of aqueous NaCl.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that in the electrolysis of aqueous NaCl, the product obtained is not H₂ gas.
- This is incorrect because during the electrolysis of aqueous NaCl, H₂ gas is indeed produced at the cathode.

2. **Analyzing the Electrolysis Process**:
- When NaCl is dissolved in water, it dissociates into Na⁺ and Cl⁻ ions. Additionally, water dissociates into H⁺ and OH⁻ ions.
- At the cathode (negative electrode), reduction occurs. The H⁺ ions from water are reduced to form H₂ gas:
\[ 2H^+ + 2e^- \rightarrow H_2(g) \]
- Therefore, H₂ gas is produced at the cathode.

3. **Understanding the Reason**:
- The reason states that generally gases are liberated faster than metals during electrolysis.
- This is true because gases, being in a gaseous state, can escape the solution more readily than solid metals can deposit on the electrode.

4. **Conclusion**:
- Since the assertion is incorrect (H₂ gas is produced) and the reason is correct (gases are liberated faster than metals), the overall conclusion is that the assertion is false while the reason is true.

5. **Final Answer**:
- The correct option is that the assertion is false and the reason is true.