51. Entropy change of a system and its surroundings in equilibrium

1. 1. Increases

   
   
   

   2. Decreases

   
   
   

   3. Remains constant

   
   
   

   4. Either increases of decreases

   
   
   

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   NA

   Correct Option: C

   NA

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52. The compound with negative heat of formation is known as

1. 1. Endothermic conpound

   
   
   

   2. Exothermic compound

   
   
   

   3. Ecdoergonic compound

   
   
   

   4. None of the above

   
   
   

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   NA

   Correct Option: B

   NA

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53. According to latests sign conventions, the correct expression representing the first law of thermodynamics

1. 1. ∇U = q + w

   
   
   

   2. ∇U = ∇H + pV

   
   
   

   3. ∇U = q - w

   
   
   

   4. All the ecpressions are correct

   
   
   

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   Na

   Correct Option: A

   NA

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