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Question

Identify the correct statements regarding entropy

A
At 0o C, the entropy of a perfectly crystalline substance is taken to be zero
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B
At absolute zero of temperature, the entropy of all perfectly crystalline substance is positive
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C
At absolute zero of temperature, the entropy of all crystalline substance is taken to be negative
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D
At absolute zero of temperature, the entropy of a perfectly crystalline substance is taken to be zero
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Solution

The correct option is D At absolute zero of temperature, the entropy of a perfectly crystalline substance is taken to be zero
According to the third law of thermodynamics :
The entropy of all perfect crystalline substances is zero at T = 0 K (or absolute zero).

As, at T = 0 K, all energy of thermal motion has been quenched, and in a perfect crystal all the atoms or ions are in a regular, uniform array.

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