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Write chemical equations involved to obtain :

(i) $Cu$ from $Cu_{2}S$

(ii) $Ag$ from $\left [ Ag(CN) _{2}\right ]^{-}$ complex

Answers (1)

(i) 2Cu₂S + 3O₂ $\rightarrow$ 2Cu₂O + 2SO₂

2Cu₂O + Cu₂S $\rightarrow$ 6Cu + SO₂ $\rightarrow$ 2Cu + CO

(ii) 2[Ag(CN)₂]^- _(aq.) + Zn_(s) $\rightarrow$ 2Ag_(s)+ [Zn(CN)4]^-2 _(aq.)

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