Assertion. Chlorine when solidifies doe not have zero entropy even at absolute zero.
Reason. Chlorine is a pungent smelling gas and it is difficult to solidify it.

Options

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

Answer

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

### Step 1: Understand the Assertion
The assertion states that "Chlorine when solidifies does not have zero entropy even at absolute zero."

- **Entropy** is a measure of disorder or randomness in a system. According to the third law of thermodynamics, the entropy of a perfect crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin). However, for a substance to have zero entropy at absolute zero, it must be a perfectly crystalline substance.

### Step 2: Analyze Chlorine's Structure
Chlorine (Cl2) is a diatomic molecule and does not form a perfect crystal structure when solidified.

- This means that even when chlorine is solidified, it does not achieve the perfect order required for its entropy to be zero. Therefore, the assertion is correct.

### Step 3: Understand the Reason
The reason states that "Chlorine is a pungent smelling gas and it is difficult to solidify it."

- While it is true that chlorine is a pungent gas and solidifying it can be challenging, this fact does not explain why its entropy does not reach zero when solidified. The difficulty in solidifying chlorine does not relate to the entropy value at absolute zero.

### Step 4: Conclusion
- The assertion is true because chlorine does not have zero entropy when solidified due to its non-perfect crystalline structure.
- The reason is also true, but it does not provide a valid explanation for the assertion.

Thus, the correct answer to the question is that both the assertion and reason are true, but the reason is not the correct explanation of the assertion.

### Final Answer
The correct answer is: **Option 2 - Both assertion and reason are true, but reason is not the correct explanation of assertion.**

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