Match List-I with List-II and select the correct answer using the codes given below the lists:
| List-I (Metal) | List-II (Refining process) |
|---|---|
| a. Ni | 1. Van Arkel process |
| b. Cu | 2. Electrolysis |
| c. Zr | 3. Mond process |
| d. Ge | 4. Zone refining |
Codes (in the order a b c d):
- A1 4 3 2
- B2 3 4 1
- C4 1 2 3
- D3 2 1 4
Show answer and explanation
Correct answer: (d) 3 2 1 4
Explanation
- (a) Nickel → 3, Mond process: nickel forms volatile nickel carbonyl, Ni(CO)₄, with carbon monoxide; heating this gives pure nickel.
- (b) Copper → 2, electrolysis: impure copper is the anode and pure copper collects on the cathode.
- (c) Zirconium → 1, Van Arkel process: zirconium forms a volatile iodide that decomposes on a hot filament into very pure metal.
- (d) Germanium → 4, zone refining: used for very pure semiconductors such as germanium and silicon.
So the code is 3 2 1 4.