Question

Monds process is used for :

• A. Ni
• B. Al
• C. Fe
• D. Cu

Answer 1

Answer: (A)

Mond's process is used for the purification of nickel by converting it to volatile nickel carbonyl
$\underset{\text{ Impure }}{\mathrm{Ni}}+4CO\stackrel{80^{\circ }C}{\to }Ni(CO{)}_4$
$\stackrel{180^{\circ }C}{\to }\underset{\text{ Impure }}{\mathrm{Ni}}+4CO$
Aluminium is concentrated by Baeyer's process (chemical method) and reduced by electrolytic reduction (Hall's process) in which pure $Al$ is obtained at cathode.
$Fe$ is concentrated by hydraulic washing followed by calcination to remove moisture. It is then reduced by $CO$ (smelting) in a blast furnace.
$F{e}_2{O}_3+2CO⟶FeO+C{O}_2$
$FeO+CO⟶Fe+C{O}_2$
$Cu$ is obtained by oxidation of sulphide ore followed by self reduction.
$C{u}_{2}S+2O_2⟶2CuO+S{O}_2$
$C{u}_{2}S+2C{u}_{2}O⟶6Cu+S{O}_2\uparrow$
$Cu$ is further purified by electrolysis of $CuS{O}_4$ solution with impure $Cu$ as anode.