Assertion . `CaF_(2)` has been given the name fluorspar .
Reason. Solid `CaF_(2)` emits light when heated .

Options

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

Answer

To analyze the given assertion and reason, we will break down the statements and evaluate their truthfulness and relationship.

### Step 1: Evaluate the Assertion
The assertion states that "CaF₂ has been given the name fluorspar."
- **Truthfulness**: This statement is true. Calcium fluoride (CaF₂) is indeed commonly known as fluorspar.

### Step 2: Evaluate the Reason
The reason states that "Solid CaF₂ emits light when heated."
- **Truthfulness**: This statement is also true. When solid CaF₂ is heated, it can emit light due to its fluorescent properties.

### Step 3: Analyze the Relationship Between Assertion and Reason
- The assertion is true, and the reason is also true. However, we need to determine if the reason correctly explains the assertion.
- **Explanation**: The assertion refers to the name "fluorspar," which is derived from the mineral's ability to fluoresce under UV light, not specifically from the light emitted when heated. The reason, while true, does not directly explain why CaF₂ is called fluorspar.

### Conclusion
- Both the assertion and reason are true, but the reason does not provide a correct explanation for the assertion. Therefore, the correct answer would indicate that the assertion is true, the reason is true, but the reason is not the correct explanation for the assertion.

### Final Answer
- Assertion: True
- Reason: True
- Explanation: The reason does not correctly explain the assertion.

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