Chemistry - Metallurgy Question with Solution | TestHub

Consider the following metallurgical processes:

(I)Heating impure metal with CO and distilling the resulting volatile carbonyl (b.p. $43^{\circ }\mathrm{C}$ ) and finally
decomposing at $150^{\circ }-200^{\circ }\mathrm{C}$ to get the pure metal

(II)Heating the sulphide ore in air until a part is converted to oxide and then further heating in the
absence of air to let the oxide react with unchanged metal sulphide.

(III)Electrolysis of the molten electrolyte containing approximately equal amounts of the metal chloride
and NaCl to obtain the metal

The processes used to obtaining magnesium, nickel and copper respectively are: