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Question

Which of the following statements must be true for the entropy of a pure solid to be zero?
I. The temperature must be zero kelvin.
II. The solid must be perfectly crystalline.
III. The solid must be an element
IV. The solid must be ionic.

A
I
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B
I and II
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C
I,II and III
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D
All are correct
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Solution

The correct option is B I and II
The entropy of a pure solid is zero only when there is no movement of particles, all the motions are completely seized and this is only possible if
1. the temperature must be zero kelvin
2. the solid must be perfectly crystalline.

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