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Leaching of Ag(2)S is carried out by hea...

Leaching of `Ag_(2)S` is carried out by heating it with a dilute solution of:

A

`NaCN`only

B

`HC1`

C

`NaOH`

D

`NaCh` in presence of `O_(2)`

Text Solution

Verified by Experts

The correct Answer is:
D
`Ag_(2)S ("Conc. ore") +2Na CN overset("Air")(hArr)2AgCN+Na_(2)S`
`Ag_(2)S` and `AgCN` are in equilibrium so `Na_(2)s` is oxidised by air in to `Na_(2)So_(4)`. Hence equilibrium shift towards right side.
`4Na_(2)S +5O_(2) +2H_(2)O rarr 2Na_(2)SO_(4) +4NaOH +2s`
`AgCN +NaCN rarr Na[Ag(CN)_(2)]` (soluble complex)
`2Na[Ag(CN)_(2)] +Zn (dust) rarr 2Ag +Na_(2)[Zn(CN)_(4)]`.
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