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Identify the correct statement regarding entropy:

1. At absolute zero of temperature, entropy of a perfectly crystalline substance is five
2. At absolute zero of temperature, entropy of all crystalline substances is taken to be zero
3. At 0°C, the entropy of a perfectly crystalline substance is taken to be zero
4. At absolute zero of temperature, the entropy of a perfectly crystalline substance is taken to be zero

Correct answer: At absolute zero of temperature, the entropy of a perfectly crystalline substance is taken to be zero

Solution

According to the third law of thermodynamics, the entropy of a perfectly crystalline substance is zero at absolute zero temperature because the system is in a perfectly ordered state.

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