JEE Main 2021 · 24 February · evening · Single correct · +4 / −1
Math List - I with List - II.
Choose the correct answer from the options given below :
| List I (Metal) | List II (Ores) | ||
|---|---|---|---|
| (a) | Aluminium | (i) | Siderite |
| (b) | Iron | (ii) | Calamine |
| (c) | Copper | (iii) | Kaolinite |
| (d) | Zinc | (iv) | Malachite |
- (a) (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
- (b) (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
- (c) (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
- (d) (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
Answer and solution
Answer (c) (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
Solution
Chemistry ma’am · 3 steps
Read each ore's formula and the metal jumps out: siderite is iron, kaolinite is aluminium.
- Use the formula. Each ore name stands for a compound. Write its formula, and the metal in it tells you which row it belongs to.
Ore Formula Metal it gives (i) Siderite FeCO₃ Iron, so (b)-(i) (ii) Calamine ZnCO₃ Zinc, so (d)-(ii) (iii) Kaolinite Al₂(OH)₄Si₂O₅ Aluminium, so (a)-(iii) (iv) Malachite CuCO₃.Cu(OH)₂ Copper, so (c)-(iv) - Note on kaolinite. Kaolinite is a clay, an aluminium silicate. Bauxite is the main ore of aluminium, but kaolinite is the aluminium mineral in this list.
- So. The matching is (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii), which is option (c).
The idea to keep. Learn each ore with its formula, not just its name. Carbonate ores to remember: siderite FeCO₃, calamine ZnCO₃, malachite CuCO₃.Cu(OH)₂.
Answer from the NTA final answer key. Solution by PrepWiser.