151. The vapour density of a volatile substance is 4 (CH₄ =1). Its molecular mass would be

1. 1. 2

   
   
   

   2. 8

   
   
   

   3. 64

   
   
   

   4. 128

   
   
   

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   NA

   Correct Option: D

   NA

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152. A hybrid orbital has 25% s-character and 75% p - character. To which type of hybridization it belongs

1. 1. sp³

   
   
   

   2. sp²

   
   
   

   3. sp

   
   
   

   4. s²p

   
   
   

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   NA

   Correct Option: A

   NA

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153. The hydrogen bond is strongest in which one of the following

1. 1. F - H --- F

   
   
   

   2. O - H ---- O

   
   
   

   3. S - H ---- F

   
   
   

   4. F - H ---- O

   
   
   

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   NA

   Correct Option: A

   NA

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154. When ether is exposed in air for sometime, and explosive substance is produced, the substance is

1. 1. Peroxide

   
   
   

   2. TNT

   
   
   

   3. Oxide

   
   
   

   4. Superoxide

   
   
   

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   NA

   Correct Option: A

   NA

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155. The factor adversely adversely affecting the fermentation process is

1. 1. Presence of air

   
   
   

   2. Low concentration of sugar

   
   
   

   3. High concentration of sugar

   
   
   

   4. Presence of an enzyme

   
   
   

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   NA

   Correct Option: C

   NA

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