Assertion : Mercury vapour is shining silvery in appearance.
Reason : Mercury is a metal with shining silvery appearance.

Options

A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion
B. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
C. Assertion is true but Reason is false
D. Both Assertion and Reason are false

Explanation

To solve the assertion-reason question regarding mercury vapour and its appearance, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Mercury vapour is shining silvery in appearance."
- We need to evaluate if this statement is true or false.

2. **Evaluating the Assertion**:
- Mercury in its liquid state has a silvery appearance. However, mercury vapour is not visible and does not exhibit the same properties as liquid mercury.
- In the vapour phase, mercury does not have metallic bonding, which means it cannot reflect light like a solid or liquid metal would.
- Therefore, the assertion is **false**.

3. **Understanding the Reason**:
- The reason states that "Mercury is a metal with shining silvery appearance."
- This statement is true as liquid mercury does indeed have a shiny, silvery appearance.

4. **Evaluating the Reason**:
- Although the reason is true, it does not support the assertion because the assertion itself is false. The reason describes the properties of liquid mercury, not vapour.

5. **Conclusion**:
- Since the assertion is false and the reason is true, we conclude that both the assertion and reason are incorrect in the context of the assertion being true.

### Final Answer:
- Both the assertion and reason are incorrect.