Question

If entropy of a solid is greater than zero, at T = 0, it is called ______.

Options

• formal entropy

• standard entropy

• residual entropy

• absolute entropy

Answer 1

If entropy of a solid is greater than zero, at T = 0, it is called residual entropy.

Explanation:

The term "residual entropy" refers to the amount of entropy in a solid that is more than zero, as T = O. It is the entropy difference between a non-equilibrium state and the crystal state of a substance near absolute zero.

Carbon monoxide, which has a relatively small dipole moment, is a common example. Few carbon monoxide molecules have enough time to organise themselves into a flawless crystal as the carbon monoxide crystal cools to absolute zero.