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The metal extracted by leaching with cyanide isA. MgB. AgC. CuD. Na |
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Answer» Correct Answer - 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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