Chemistry-
General
Easy

Question

If the inversion temperature of a gas is -80°C, then it will produce cooling under Joule-Thomson effect at

  1. 298 K    
  2. 273 K    
  3. 193 K    
  4. 173 K    

The correct answer is: 273 K

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For a perfectly crystalline solid C subscript p comma m end subscript equals a T to the power of 3 end exponent plus b T, where a and b are constant. If C subscript p comma m end subscript is 0.40 J/K mol at 10 K and 0.92 J/K mol at 20 K, then molary entropy at 20 K is :

For a perfectly crystalline solid C subscript p comma m end subscript equals a T to the power of 3 end exponent plus b T, where a and b are constant. If C subscript p comma m end subscript is 0.40 J/K mol at 10 K and 0.92 J/K mol at 20 K, then molary entropy at 20 K is :

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What are the signs of the entropy change (+ or - ) in the following:
I) A liquid crystallises into a solid
II) Temperature of a crystalline solid is raised from 0 K to 115 K
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I) A liquid crystallises into a solid
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