Match the items of Column I with item of Column II and assign the correct code.

Answer

A

Explanation

(A) Cyanide process is used for the extraction of noble metals which are not attacked by air, oxygen or water
(B) Froth floatation process is used for sulphide ores.
(C) As Al is very electropositive element, it is reduced by electrolytic method
(D) Elements which used as semi – conductors are refined by zone – refining process.