1.

Mention the reaction representing example of leaching.

Answer»

`3Fe_(2)O_3 + CO to 2Fe_3O_4 + CO_2` 
`Cu_2S + 3O_2 to 2Cu_2O + 2SO_2`
`4M + 8CN^(-) + 2H_2O + O_2 to 4[M(CN)_2]^(-) + 4OH^(-)` 
`ZnCO_3 overset(DELTA)(rarr) ZnO_((s)) + CO_(2(g))`

Answer :C


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