46. Which of the following are not concentrated by froth floatation method ?

1. 1. Copper pyrite

   
   
   

   2. Pentlandite

   
   
   

   3. Pyrolusite

   
   
   

   4. Zinc blende

   
   
   

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   NA

   Correct Option: B

   NA

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47. Pb and Sn are extracted from their chief ore by

1. 1. Carbon reduction and self reduction

   
   
   

   2. Self reduction and carbon reduction

   
   
   

   3. Electrolysis and self reduction

   
   
   

   4. Self reduction and electrolysis

   
   
   

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   NA

   Correct Option: B

   NA

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48. The purification of alumina is done by

1. 1. Baeyer's process

   
   
   

   2. Hoop's process

   
   
   

   3. Bosch process

   
   
   

   4. Castner process

   
   
   

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   NA

   Correct Option: A

   NA

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49. Match the following
    

    	List-I		List-II
    F.	Zn	1.	Amalagamation
    G.	Ag	2.	Self reduction
    H.	Fe	3.	Carbon reduction
    J.	Ca	4.	carbon monoxide reduction
    K.	Cu	5.	Fused salt electroysis

    Codes :

    	F	G	H	J	K
    A.	3	1	4	5	2
    B.	2	4	3	1	5
    C.	5	1	2	4	3
    D.	5	3	4	2	1

1. 1. A.

   
   
   

   2. B.

   
   
   

   3. C.

   
   
   

   4. D.

   
   
   

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   NA

   Correct Option: A

   NA

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50. 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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