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Explain the role of each of the followin...

Explain the role of each of the following :
(i) NaCN in the extraction of silver
(ii) `SiO_(2)` in the extraction of copper

Text Solution

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(i) NaCN is behave as a leaching agent and form soluble complex silver , from which metal is obtained later by replacement .
`4Ag + 8CN^(-) + 2H_(2)O + O_(2) to [Ag(CN)_(4)]^(2-) + 2 Ag`
(ii) Silica is used to remove impurity of iron oxide in the form of slag in the metallurgy of copper .
`FeO + SiO_(2) to underset(("slag"))(FeSiO_(3))`
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