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Identify the correct statement regarding entropy.

(a) At absolute zero of temperature, entropy of a perfectly crystalline substance is taken to be zero 

(b) At absolute zero of temperature, the entropy of a perfectly crystalline substance is positive 

(c) Absolute entropy of a substance cannot be determined 

(d) At 0ºC, the entropy of a perfectly crystalline substance is taken to be zero. 

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(a) At absolute zero of temperature, entropy of a perfectly crystalline substance is taken to be zero

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