Identify the correct statement regarding entropy. (a) at...

Identify the correct statement regarding entropy. (a) at absolute zero temperature, entropy of a perfectly crystalline substance is +ve. (b) at absolute zero temperature, entropy of a perfectly crystalline substance is taken to be zero (c) at absolute zero temperature, entropy of all crystalline substances in taken to be 0 . (d) at $0^{\circ} \mathrm{C}$, entropy of a perfectly crystalline substance is taken to be 0 .

Identify the correct statement regarding entropy.
(a) at absolute zero temperature, entropy of a perfectly crystalline substance is +ve.
(b) at absolute zero temperature, entropy of a perfectly crystalline substance is taken to be zero
(c) at absolute zero temperature, entropy of all crystalline substances in taken to be 0 .
(d) at $0^{\circ} \mathrm{C}$, entropy of a perfectly crystalline substance is taken to be 0 .

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Key Concepts

Perfect Crystalline Substance

A perfect crystalline substance is an ideal material in which the constituent particles are arranged in a perfectly ordered structure, without any defects. This idealization is crucial for applying the third law of thermodynamics, as it allows the assumption that the entropy at absolute zero is exactly zero.

Absolute Zero Temperature

Absolute zero, defined as 0 Kelvin, is the theoretical temperature at which a system reaches its minimum possible energy and the motion associated with thermal energy is minimal. It is the point at which a perfect crystalline substance would have zero entropy according to the third law.

Entropy

Entropy is a thermodynamic quantity that measures the level of disorder or randomness in a system. It is a state function, meaning its value depends solely on the current state of the system and not on how the system reached that state.

Third Law of Thermodynamics

The Third Law of Thermodynamics states that the entropy of a perfect crystal at absolute zero temperature is exactly zero. This provides an absolute reference point for the determination of entropy for other substances and conditions.

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