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Ag and Au are extracted by leaching thei...

`Ag` and `Au` are extracted by leaching their ores with a dilute solution of `NaCN`.
Impurities associated with these ores dissolve in `NaCN`.

A

Mg

B

Ag

C

Cu

D

Na

Text Solution

Verified by Experts

The correct Answer is:
B
Silver ore forms a soluble complex when leached with NaCN solution and from which silver is precipitated using scrap zinc.
`Ag_(2)S("conc. Ore")+2NaCNoverset(Air)iff2AgCN+Na_(2)S`
`4Na_(2)S+5O_(2)+2H_(2)Oto2Na_(2)SO_(4)+4NaOH+2S`
`Na_(2)S` is converted in to `Na_(2)SO_(4)` Hence equilibrium shifts towards right side.
`AgCN+NaCNtoNa[Ag(CN)_(2)]` (soluble complex)
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