161. Which of the following processes is not used for the purification of solid impurities ?

1. 1. sublimation

   
   
   

   2. distillation

   
   
   

   3. vaporisation

   
   
   

   4. crystallization

   
   
   

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   NA

   Correct Option: B

   NA

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162. The lanthanide contraction i responsible for the fact that

1. 1. Zr an Y have about he same radius

   
   
   

   2. Zr and Zn have the same oxidation state

   
   
   

   3. Zr and Hf have about is same redius

   
   
   

   4. Zr and Nb have similar oxidation state

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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163. Which is most active metal among the following

1. 1. Al

   
   
   

   2. Cu

   
   
   

   3. Ni

   
   
   

   4. Pb

   
   
   

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   NA

   Correct Option: A

   NA

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164. Metal, which forms coloured chloride is

1. 1. Al

   
   
   

   2. Cr

   
   
   

   3. Sn

   
   
   

   4. Zn

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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165. Bell metal is an alloy of

1. 1. Cu + Pb

   
   
   

   2. Cu + Zn

   
   
   

   3. Cu + Ni

   
   
   

   4. Cu + Sn

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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