Assertion: Anthracite is the purest form of coal.
Reason: It contains about 50% of carbon.

Options

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

Answer

To solve the question, we need to evaluate both the assertion and the reason provided.

### Step 1: Analyze the Assertion
The assertion states: "Anthracite is the purest form of coal."
- Anthracite is indeed considered the highest grade of coal. It has the highest carbon content compared to other types of coal.

### Step 2: Analyze the Reason
The reason states: "It contains about 50% of carbon."
- This statement is incorrect. Anthracite actually contains about 86-92% of carbon, which is significantly higher than 50%.

### Step 3: Conclusion
- The assertion is true because anthracite is the purest form of coal.
- The reason is false because anthracite contains much more than 50% carbon.

### Final Answer
- The assertion is true, but the reason is false.