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Extraction of silver is achieved by initial complexation of the ore(Argentite) with “X' followed by reduction with ”Y". “X” and “Y” respectively are

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${CN}^{-} and Zn$

${CN}^{-} and Cu$

${Cl}^{-} and Zn$

${Br}^{-} and Zn$

answer is A.

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Detailed Solution

Hydro metallurgy

$\overset{}{{Ag}_{2} S +} 4 NaCN \to 2 Na [Ag {(CN)}_{2}] + {Na}_{2} S 2 Na [Ag {(CN)}_{2}] + Zn \overset{Reduction}{\to} {Na}_{2} [Zn {(CN)}_{4}] + 2 Ag$

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