Question

Match the refining methods (Column I) with metals (Column II)

Column I	Column II
(Refining methods)	(Metals)
(I) Liquation	(a) Zr
(II) Zone Refining	(b) Ni
(III) Mond Process	(c) Sn
(IV) Van Arkel Method	(d) Ga

1. (I)-(c); (II)-a); (III)-(b); (IV)-(d)
2. (I)-(b); (II)-(c); (III)-(d); (IV)-(a)
3. (I)-(c); (II)-(d); (III)-(b); (IV)-(a)
4. (I)-(b); (II)-(d); (III)-(a); (IV)-(c)

Answer 1

Correct Answer - Option 3 : (I)-(c); (II)-(d); (III)-(b); (IV)-(a)

Concept:

Liquation is a metallurgical method for separating metals from an ore or alloy. The material must be heated until one of the metals starts to melt and drain away from the other and can be collected. Liquation is used for Tin (Sn).

Zone refining is a technique for the purification of a crystalline material and especially a metal in which a molten region travels through the material to be refined, and then allows the purified part to recrystallize at its opposite edge. Zone refining is used for Gallium (Ga).

The Mond’s process or carbonyl process is a process to extract and purify the nickel. The impure nickel reacts with carbon monoxide at 50^o to 60 C to form the gas nickel carbonyl, leaving the impurities as solids. This process is used for refining of Nickel (Ni).

The Van Arkel Method is used to prepare the ultra-pure metals. Crude metal is heated with a suitable substance so that the pure metal present in it may be converted into stable volatile compound leaving behind impurities. The compound so formed is then decomposed by heating to get the pure metal. This method is used for Zirconium (Zr).

So, the correct matched pair is (I)-(c); (II)-(d); (III)-(b); (IV)-(a).