146. Pure nitrogen is obtained from

1. 1. NH₃ + NaNO₂

   
   
   

   2. NH₄CI + NaNO₂

   
   
   

   3. N₂O + Cu

   
   
   

   4. (NH₄)₂ Cr₂O₇

   
   
   

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   NA

   Correct Option: D

   NA

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147. Iodine deficiency in diet is known to cause

1. 1. Beri-beri

   
   
   

   2. Goitre

   
   
   

   3. Rickets

   
   
   

   4. Night-blindnets

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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148. Which one of the following is solid at room temperature ?

1. 1. CI₂

   
   
   

   2. F₂

   
   
   

   3. I₂

   
   
   

   4. Br₂

   
   
   

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   NA

   Correct Option: C

   NA

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149. Which of the following is metallic in nature ?

1. 1. F

   
   
   

   2. CI

   
   
   

   3. Br

   
   
   

   4. I

   
   
   

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   NA

   Correct Option: D

   NA

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150. Bromine gas turns starch iodine paper

1. 1. Blue

   
   
   

   2. Red

   
   
   

   3. Colourless

   
   
   

   4. Yellow

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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