Liquation process may be applied for the purification of:

To make the following reduction process spontaneous, temperature should be:

$\mathrm{ZnO}+\mathrm{C}⟶\mathrm{Zn}+\mathrm{CO}$

In the process of extraction of gold:

$\mathrm{Roasted} \mathrm{gold} \mathrm{ore}+{\mathrm{CN}}^{-}+{\mathrm{H}}_2\mathrm{O}\stackrel{{\mathrm{O}}_2}{\to }\mathrm{ }\left[\mathrm{X}\right]\mathrm{ }+{\mathrm{OH}}^{-}$
$\left[\mathrm{X}\right]+\mathrm{Zn}⟶\left[\mathrm{Y}\right]+\mathrm{Au}$
Identify the complexes [$\mathrm{X}$] and [$\mathrm{Y}$].