Out of Cu(2)S, HgS, Ag(2)S, PbS and ZnS,...

Out of `Cu_(2)S, HgS, Ag_(2)S, PbS and ZnS`, roasting will convert, the minerals into metal in case of:

A

`Cu_(2)S,Zns`

B

Hgs,ZnS

C

`Cu_(2)S,Ag_(2)S`

D

HgS

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The correct Answer is:

4

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