Question

Match List-1 with List-2:

Column 1	Column 2
Mercury	Vapour phase refining
Copper	Distillation refining
Silicon	Electrolytic refining
Nickel	Zone refining

Answer 1

1. Distillation refining: Mercury and zinc are two examples of metals whose boiling points are low and can be purified using this technique.
2. Electrolytic refining: By using the electrolytic process, a metal (most commonly copper) is refined through electrolytic refining.
3. Zone refining: A method of purifying crystalline materials, notably metals, in which a molten region passes through the substance to be refined, picks up impurities at its forward edge, and then permits the purified section to recrystallize at its backward edge. Silicon is used in this process.
4. Vapour Phase refining: In the process of vapour-phase refining, metal is refined by first being reduced to its volatile component, which is then broken down to produce pure metal.

Final answer: Hence, the correct match is-

List-1	List-2
Mercury	Distillation refining
Copper	Electrolytic refining
Silicon	Zone refining
Nickel	Vapour phase refining