16. Which one of the following is unhydrous of nitrous and

1. 1. N₂O

   
   
   

   2. N₂O₃

   
   
   

   3. N₂O₄

   
   
   

   4. NO

   
   
   

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   NA

   Correct Option: B

   NA

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17. The chemical used for cooling in refrigeration is

1. 1. CO₂

   
   
   

   2. NH₂OH

   
   
   

   3. NH₂CI

   
   
   

   4. La.NH₃

   
   
   

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   NA

   Correct Option: D

   NA

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18. Which gas is formed on lightning ?

1. 1. N₂O

   
   
   

   2. NO

   
   
   

   3. NO₂

   
   
   

   4. N₂O₅

   
   
   

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   NA

   Correct Option: B

   NA

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19. Which of the following is used as an antiseptic ?

1. 1. I

   
   
   

   2. F

   
   
   

   3. Br

   
   
   

   4. CI

   
   
   

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   NA

   Correct Option: A

   NA

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20. Sulphuric acid has great affinity for water because

1. 1. It hydrolyses the acid

   
   
   

   2. It decomposes the acid

   
   
   

   3. Acid forms hydrates with water

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: C

   NA

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