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  • (a) What is the difference between calamine and malachite (b) Why is zinc used instead of Cu for recovery of Ag from (c) What is the role of cryolite in metallurgy of Al

(a) What is the difference between calamine and malachite ?

(b) Why is zinc used instead of Cu for recovery of Ag from  [Ag(CN)_2]^- ?

(c) What is the role of cryolite in metallurgy of Al ?

 

 

 

 
 
 
 
 

Answers (1)

(a) Calamine (ZnCO_3) is zinc ore whereas malachite (CuCO_3\cdot Cu(OH)_2) is a copper ore.

(b) Zinc is used instead of copper for recovery of Ag from [Ag(CN)_2]^- as zinc is a powerful reducing agent and the product (zinc cyanide) formed is easily disposible.

(c) Cryolite (Na_3AlF_6) decreases the melting point and increases condectivity.

 

Posted by

Sumit Saini

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