Question

The metal which is extracted by oxidation and subsequent reduction from its ore is:

• A. $Al$
• B. $Cu$
• C. $Ag$
• D. $Fe$

Answer 1

Answer: (C)

$Ag$.
$4Ag+8C{N}^{-}+O_2+2H_{2}O\to 4{\left[Ag(CN{)}_2\right]}^{-}+4O{H}^{-}$
$2{\left[Ag(CN{)}_2\right]}^{-1}+Zn\to 2Ag\downarrow +{\left[Zn(CN{)}_4\right]}^{-2}$