JEE Main 2021 · 26 February · evening · Single correct · +4 / −1
Match List - I with List - II.
Choose the correct answer from the options given below :
| List - I | List - II | ||
|---|---|---|---|
| (a) | Siderite | (i) | Cu |
| (b) | Calamine | (ii) | Ca |
| (c) | Malachite | (iii) | Fe |
| (d) | Cryolite | (iv) | Al |
| (v) | Zn |
- (a) (a) → (i), (b) → (ii), (c) → (iii), (d) → (iv)
- (b) (a) → (iii), (b) → (i), (c) → (v), (d) → (ii)
- (c) (a) → (i), (b) → (ii), (c) → (v), (d) → (iii)
- (d) (a) → (iii), (b) → (v), (c) → (i), (d) → (iv)
Answer and solution
Answer (d) (a) → (iii), (b) → (v), (c) → (i), (d) → (iv)
Solution
Chemistry ma’am · 3 steps
Write the formula of each ore first, and the metal stares right back at you from it.
- Recall the formulae. Each name in List - I is a common ore. Once you write its chemical formula, the metal it is mined for is the main metal atom in that formula.
Ore Formula Metal Siderite FeCO₃ Fe, (iii) Calamine ZnCO₃ Zn, (v) Malachite CuCO₃.Cu(OH)₂ Cu, (i) Cryolite Na₃AlF₆ Al, (iv) - Leftover entry. Ca, (ii), matches none of these ores. It is only there as a distractor.
- So. The matching is (a) → (iii), (b) → (v), (c) → (i), (d) → (iv), which is option (d).
The idea to keep. Learn ores as name plus formula, never name alone. Siderite and calamine are carbonates of Fe and Zn, malachite is a basic copper carbonate, and cryolite is Na₃AlF₆.
Answer from the NTA final answer key. Solution by PrepWiser.