Question

If the entropy of a solid is greater than zero, at \( T = 0 \), it is called

• A. Standard entropy
• B. Residual entropy
• C. Formal entropy
• D. Absolute entropy

Hint:

Residual entropy is a result of the disorder that remains in a system even at absolute zero temperature.

Answer 1

The Correct Option is B

Step 1: Understanding entropy at absolute zero.
At \( T = 0 \), the entropy of a solid can be greater than zero due to disorder that remains in the system, even at absolute zero. This is known as residual entropy.

Step 2: Analyzing the options.
(A) Standard entropy: Standard entropy refers to the entropy at a standard temperature (usually 298 K).
(B) Residual entropy: Correct — Residual entropy refers to the entropy remaining at \( T = 0 \) due to residual disorder in the solid.
(C) Formal entropy: This is not a standard term in thermodynamics.
(D) Absolute entropy: This is the entropy at any temperature, not specifically at \( T = 0 \).

Step 3: Conclusion.
The correct answer is (B) Residual entropy.