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Leaching of `Ag_(2)S` is carried out by heating it with a dilute solution of:A. `NaCN`onlyB. `HC1`C. `NaOH`D. `NaCh` in presence of `O_(2)` |
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Answer» Correct Answer - 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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