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Q)

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) $N_2O$

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A)
Answer: perfectly crystalline solids
The Third Law of Thermodynamics states, “The entropy of a perfect crystal is zero when the temperature of the crystal is equal to absolute zero (0 K).”
The entropy of a perfect crystal at absolute zero is exactly equal to zero.
 
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A)
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
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