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

Ag is first extracted by oxidation and then the subsequent reduction is carried out to obtain <br/><br/> $$ \begin{aligned} & \begin{aligned} 4 \mathrm{Ag}+8 \mathrm{NaCN}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2} \end{aligned} \stackrel{\text { Oxidation }}{\longrightarrow} 4 \mathrm{Na}\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]+4 \mathrm{NaOH} \\\\ & 2 \mathrm{Na}\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]+\mathrm{Zn} \stackrel{\text { reduction }}{\longrightarrow} \mathrm{Na}_{2}\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]+2 \mathrm{Ag} \end{aligned} $$