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Chemistry
Which of the following statement regarding entropy is correct?
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Q. Which of the following statement regarding entropy is correct?
AIIMS
AIIMS 1994
A
At absolute zero temperature, the entropy of all crystalline substances is taken to be zero
B
At 0$^{\circ}$C, the entropy of all crystalline substances is taken to be zero
C
At absolute zero temperature,entropy of a perfect crystalline substance is taken to be zero
D
At 0$^{\circ}$C, the entropy of a perfect crystalline substance is taken to be zero
Solution:
This is the statement of third law of thermodynamics. In a perfect crystal, at absolute zero temperature, each constituent of lattice must have the lowest energy, so it leads to perfect order, therefore zero entropy.