The metal extracted by leaching with cyanide is

Options

A. Mg
B. Ag
C. Cu
D. Na

Answer

B

Explanation

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)