Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

Extraction of gold and silver involves leaching with CN^$$-$$ ion. Silver is later recovered by

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

Column $${\rm I}$$			Column $${\rm I}$$$${\rm I}$$
(A)	Cyanide process		(i)	Ultrapure Ge
(B)	Froth floatation process		(ii)	Dressing of ZnS
(C)	Electrolytic reduction		(iii)	Extraction of Al
(D)	Zone refining		(iv)	Extraction of Au
			(v)	Purification of Ni

In the extraction of copper from its sulphide ore. the metal is finally obtained by the reduction of cuprous oxide with