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We know from the third law of thermodynamics, the entropy of a perfectly crystalline substance at absolute zero temperature is taken to be zero.

1. Entropy is zero for perfectly crystalline solid at absolute zero.
2. Entropy states the randomness or disorderness of the system.
3. At absolute zero, the movement of molecules of the system or randomness of the system is zero, hence entropy is also zero.
4. Entropy is zero at absolute zero temperature.

Correct answer: Entropy is zero for perfectly crystalline solid at absolute zero.

Solution

The third law of thermodynamics states that the entropy of a perfectly crystalline substance approaches zero as the temperature approaches absolute zero. This is because there is no randomness or disorder in a perfect crystal at 0 K.

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