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Match items of Column I with the items of Column II and assign the correct code :
Column I Column II
(A) Cyanide process (i) Ultrapure Ge
(B) Froth flotatiion process (ii) Dressing of ZnS
(C) Electrolytic reduction (iii) Extraction of Al
(D) Zone refining (iv) Extraction of Au
(v) Purification of Ni
A B C D
1 i ii iii iv
2 iii iv v i
3 iv ii iii i
4 ii iii i v

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answer is C.

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Detailed Solution

Cyanide process– Extraction of gold and silver.
Froth floatation – Concentration of sulphide ores.
Electrolytic reduction – Extraction of highly elctropositive metals like Na, K, Mg, Ca, Al, etc.
Zone refining – Producing semicon-ductors and other metals of very high purity.

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