1.

Give an example of a sulphide ore which is reduced to metal by heating along i.e., by roasting.

Answer»

Solution :CINNABAR (HgS) on roasting is first changed to MERCURIC oxide which on further HEATING is reduced to mercury.
`2HgS(s)+3O_2(g) to^(Heat) 2HgO(s)+2SO_2(g)`
`2HgO(s) to^(Heat) 2Hg(l)+O_2(g)`


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