156. Which of the following is an ore of copper here ?

1. 1. Malachite

   
   
   

   2. Bauxite

   
   
   

   3. Dolomite

   
   
   

   4. Cinnabar

   
   
   

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   NA

   Correct Option: A

   NA

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157. Chalcopyrite is an ore of

1. 1. calcium

   
   
   

   2. copper

   
   
   

   3. magnesium

   
   
   

   4. gallium

   
   
   

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   NA

   Correct Option: B

   NA

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158. 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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159. 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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160. 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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