Write chemical equations involved to obtain :
(i) from
(ii) from complex
(i) 2Cu2S + 3O2 2Cu2O + 2SO2
2Cu2O + Cu2S 6Cu + SO2 2Cu + CO
(ii) 2[Ag(CN)2]- (aq.) + Zn(s) 2Ag(s) + [Zn(CN)4]-2 (aq.)
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