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Formation of $Ni(CO)_4$ and subsequent its decomposition into $Ni$ and $CO$ (recycled) makes basis of Mond's process
$Ni + 4CO \xrightarrow{{{T_1}}} Ni(CO)_4 \xrightarrow{{{T_2}}} Ni + 4CO$
$T_1$ and $T_2$ are :
$100\,^oC$, $50\,^oC$
$50\,^oC$, $100\,^oC$
$50\,^oC$, $230\,^oC$
$230\,^oC$ , $50\,^oC$
Solution
Mond process is used for the refining of nickel.
Nickel is heated with CO to form highly volatile nickel tetracarbonyl.
it is then decomposed to pure nickel at high temperature.
$\mathrm{Ni}+4 \mathrm{CO} \stackrel{50^{\circ} \mathrm{C}}{\rightarrow} \mathrm{Ni}(\mathrm{CO})_{4} \stackrel{230^{\circ} \mathrm{C}}{\rightarrow} \mathrm{Ni}+4 \mathrm{CO}$
Thus $\mathrm{T}_{1}$ and $\mathrm{T}_{2}$ are $50^{\circ} \mathrm{C}$ and $230^{\circ} \mathrm{C}$ respectively.
