Question

Consider the following metallurgical processes:

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

III. Electrolysing the molten electrolyte containing approximately equal amounts of the metal chloride and $CaC{l}_2$ to obtain the metal.

The processes used for obtaining sodium, nickel and copper are respectively:

• A. I, II and III
• B. II, III and I
• C. III, I and II
• D. II, I and III

Answer 1

Answer: (C)

III, I and II

III. Sodium is obtained by electrolysing the molten electrolyte containing approximately equal amounts of the sodium chloride and calcium chloride.
I. Impure nickel is heated with $CO$ and the volatile nickel tetraarbonyl $(b.p.{43}^{\circ }C)$ is distilled and then decomposed at ${200}^{\circ }C$ to obtain pure nickel.
Impure $Ni+4CO\stackrel{50-{60}^{o}C}{\to }Ni(CO{)}_4\stackrel{250-{270}^{o}C}{\to }Ni+4CO$

II. The sulphide ore of copper is heated 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 sulphide.
Self-reduction of $CuStoCu$ can be carried out in either Bessemer converter or Pierce-Smith converter.

$2C{u}_{2}S+3O_2\to 2C{u}_{2}O+2S{O}_2$
$2C{u}_{2}O+C{u}_{2}S\to 6Cu+S{O}_2$
Option C is correct.