51. Which of the following is a fluoride mineral of aluminium ?

1. 1. felspar

   
   
   

   2. cryolite

   
   
   

   3. mica

   
   
   

   4. porcels

   
   
   

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   NA

   Correct Option: B

   NA

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52. During the process of electrolytic refining of copper some metal present as impurity settle as anode mud. These are

1. 1. Ag and Au

   
   
   

   2. Pb and Zn

   
   
   

   3. Fe and Ni

   
   
   

   4. Sn and Ag

   
   
   

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   NA

   Correct Option: A

   NA

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53. Which of the following methods is used to purify tin ?

1. 1. poling

   
   
   

   2. electrolytic refining

   
   
   

   3. liquation

   
   
   

   4. all of these

   
   
   

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   NA

   Correct Option: D

   NA

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54. 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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55. Metal, which forms coloured chloride is

1. 1. Al

   
   
   

   2. Cr

   
   
   

   3. Sn

   
   
   

   4. Zn

   
   
   

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   NA

   Correct Option: B

   NA

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