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Q.

‘Entropy of a perfectly crystalline substance at zero kelvin is taken as zero’. This law is known as …………….. law of thermodynamics.

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a

2nd

b

3rd

c

Nernst

d

Both (2) and (3)

answer is B.

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Detailed Solution

  • At 0 K , there is a perfectly ordered arrangement of the constituent particles of a pure crystalline substance and there is no disorder at all. 
  • Hence, its entropy is taken an zero. 
  • This statement is based on the third law of thermodynamics.
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‘Entropy of a perfectly crystalline substance at zero kelvin is taken as zero’. This law is known as …………….. law of thermodynamics.