Consider the following metallurgical processes`:`   `(I)` Heating impure metal with `CO` and
Channel: Doubtnut
Date: 2020-04-05

Consider the following metallurgical processes`:`   `(I)` Heating impure metal with `CO` and distilling the resulting volatile carbonyl `(b.p. 43^(@)C)` and finally decomposition at `150^(@)-200^(@)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 for obtaining magnesium , nickel and copper are respectively.