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According to third law of thermodynamics, the entropy at 0 K is zero for

(a) elements in their stable form
(b) perfectly crystalline solids
(c) substances at 1 atm and $25^\circ C$
(d) $N_2O$

2 Answers

Answer: perfectly crystalline solids
For perfectly crystalline solids at 0 K, all molecular motion ceases and particles are closely packed. Thus, randomness and hence entropy is minimum.
answered Feb 24, 2014 by mosymeow_1
Solution :
The entropy of a perfect crystal is zero when the temperature of the crystal is equal to absolute zero (0 K).
At zero kelvin the system must be in a state with the minimum possible energy, thus this statement of the third law holds true if the perfect crystal has only one minimum energy state
answered Jan 23 by meena.p

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