Question

Identify the correct statement regarding entropy

• A. At absolute zero temperature, entropy of a perfectly crystalline solid is zero.
• B. At absolute zero of temperature, the entropy of the perfectly crystalline substance is taken to be zero
• C. At absolute zero temperature, the entropy of all crystalline substances is zero.
• D. At $0{ }^{\circ} C$, the entropy of a perfect crystalline solid is zero.

Answer 1

Answer: (A)

The correct statement regarding entropy is:

At absolute zero temperature, entropy of a perfectly crystalline solid is zero.

It is also known as third law of thermodynamics.

But as the temperature is raised, molecules begin to vibrate. Hence, the entropy of the solid increases.