Question

Identify the correct statement regarding entropy. 

(a) At absolute zero of temperature, the entropy of all crystalline substances is taken to be zero. 

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

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

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

Answer 1

The correct option is : (c) At absolute zero of temperature, entropy of a perfectly crystalline substance is taken to be zero. 

Explanation:

The entropy of a substance increases with increase in temperature. However at absolute zero the entropy of a perfectly crystalline substance is taken as zero, which is also called as third law of thermodynamics.