301. The conversion of atmospheric nitrogen into compounds is called

1. 1. Nitrogen conversion

   
   
   

   2. Nitrogen absorption

   
   
   

   3. Nitrogen fixation

   
   
   

   4. Nitrogenation

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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302. In the manufacture of nitric acid by Ostwald's process, which of the following is used

1. 1. Pt-Rh

   
   
   

   2. Bk

   
   
   

   3. Pt

   
   
   

   4. Rh

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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303. Consider the following statements. Hard water is not suitable for
     1. Drinking
     2. Washing clothes with soap
     3. Use in boilers
     4. Irrigating crops
     Which of these statements are correct ?

1. 1. 1 and 3

   
   
   

   2. 2 and 3

   
   
   

   3. 1, 2 and 4

   
   
   

   4. 1, 2, 3 and 4

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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304. Emery consists of impure

1. 1. Iron

   
   
   

   2. Corundum

   
   
   

   3. Carborundum

   
   
   

   4. Graphite

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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305. Which one of the following is a typical non-metal ?

1. 1. Si

   
   
   

   2. Pb

   
   
   

   3. Ge

   
   
   

   4. Sn

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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