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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) During roasting copper pyrites are converted in to mixture of `FeO` and `Cu_(2)O` . To remove `Fe` (basic) an acidic flux silica is added during smelting. `FeO` then combines with `SiO_(2)` to form ferrous silicate `(Fe SiO_(3))` slag which floats over molten matter.
(ii) Role of `NaCN` in the extraction of silver is to do the leaching of silver ore in the presence of air from which the silver is obtained later by replacement.
`4Ag(s)+8CN^(-)(aq)+2H_(2)O(aq)+O_(2)(g)rarr4[Ag(CN)_(2)]^(-)(aq)+4OH^(-)(aq)`
`2[Ag(CN_(2))^(-)](aq)+Zn(s)rarr2Ag(s)+[Z(CN)_(4)^(2-)(aq)]`
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