31. The molar heat capacity of water is

1. 1. 4.184 JK^-1

   
   
   

   2. 75.3 JK^-1

   
   
   

   3. 185 JK^-1

   
   
   

   4. 1 JK^-1

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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32. When ammonium chloride is dissolved in water, the solution becomes cold. The change is

1. 1. Endothermic

   
   
   

   2. Exothermic

   
   
   

   3. Supercooling

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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33. For an endothermic reaction to be spontaneous

1. 1. ΔS must be positive

   
   
   

   2. ΔS must be negative

   
   
   

   3. ΔS must be zero

   
   
   

   4. ΔG must be positive

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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34. For the process CO₂ (s) → CO₂ (g)

1. 1. Both ΔH and ΔS are positive

   
   
   

   2. ΔH is negative and ΔS is positive

   
   
   

   3. ΔH is positive and ΔS is negative

   
   
   

   4. Both ΔH and ΔS are negative

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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35. When a gas is subjected to adiabatic expansion, it gets cooled due to

1. 1. no change in etropy

   
   
   

   2. loss in kinetic energy

   
   
   

   3. decreases in velocity

   
   
   

   4. energy spent in doing work

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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