136. Blasting of T.N.T. is made by mixing

1. 1. NH₄NO₂

   
   
   

   2. NH₄CI

   
   
   

   3. (NH₄)₂SO₄

   
   
   

   4. NH₄NO₃

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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137. Which of the following can not be used as nitrogenoum fertilizer ?

1. 1. CaNCN

   
   
   

   2. NH₄NO₃

   
   
   

   3. HNO₃

   
   
   

   4. NH₂CONH₂

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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138. Temporary hardness of water is due to the presence of

1. 1. Magnesium bicarbonate

   
   
   

   2. Calcium carbonate

   
   
   

   3. Calcium chloride

   
   
   

   4. Magnesium sulphate

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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139. The molarity of pure water at 4^°C is

1. 1. 2.5 M

   
   
   

   2. 5 M

   
   
   

   3. 1 M

   
   
   

   4. 55.5 M

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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

1. 1. CI₂

   
   
   

   2. F₂

   
   
   

   3. I₂

   
   
   

   4. Br₂

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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