Question

Match List - I with List - II :
List - I (a) Mercury (b) Copper (c) Silicon (d) Nickel
List - II (i) Vapour phase refining (ii) Distillation Refining (iii) Electrolytic Refining (iv) Zone Refining Choose the most appropriate answer from the option given below :

• A. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
• B. (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
• C. (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
• D. (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)

Hint:

{Refining Methods:}
{Distillation:} Use for low boiling metals (Zn, Hg, Cd).
{Liquation:} Use for low melting metals (Sn, Pb).
{Zone Refining:} Use for ultra-high purity semiconductors (Si, Ge, Ga).
{Vapour Phase:} Mond process for Ni; Van Arkel for Zr and Ti.

Answer 1

The Correct Option is A

This question involves matching elements from List-I with the processes used in refining these elements from List-II. Let's analyze each element and its corresponding refining process: 

1. Mercury - Mercury is typically purified by Distillation Refining. This involves heating the mercury ore so that mercury vaporizes and can later be condensed into a pure form. Thus, the correct match is (a)-(ii).
2. Copper - Copper is commonly refined using Electrolytic Refining. In this process, impure copper is made the anode, and pure copper is deposited on the cathode. Hence, the correct match is (b)-(iii).
3. Silicon - Silicon is often purified through Zone Refining. This method uses the principle of fractional crystallization and involves melting a small region of a silicon rod and moving it along the rod to purify it. Therefore, the correct match is (c)-(iv).
4. Nickel - Nickel can be refined using the Vapour Phase Refining method, specifically, the Mond Process. Nickel reacts with carbon monoxide to form nickel carbonyl, which decomposes to yield pure nickel upon heating. Thus, the correct match is (d)-(i).

Based on this analysis, the correct option is:

(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)