Question

Choose the most appropriate answer from the options given below : 

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

Hint:

Creating flashcards or a table for common ores and their formulas is an effective way to memorize them for exams. Pay special attention to ores with similar names, like Calamine (ZnCO\(_3\)) and Smithsonite (also ZnCO\(_3\)) vs Hemimorphite (a silicate of zinc).

Answer 1

The Correct Option is B

To solve this question, we need to correctly match the ores/minerals listed in List-I with their respective chemical formulas in List-II. Let's analyze each option: 

1. Calamine is a mineral that primarily contains zinc carbonate. The chemical formula for zinc carbonate is \(ZnCO_3\). Therefore, Calamine corresponds to (iii).
2. Malachite is a copper carbonate hydroxide mineral. Its chemical formula is \(CuCO_3 \cdot Cu(OH)_2\). Therefore, Malachite corresponds to (iv).
3. Siderite is an iron carbonate mineral. The chemical formula for siderite is \(FeCO_3\). Therefore, Siderite corresponds to (ii).
4. Sphalerite is a zinc sulfide mineral. Its chemical formula is \(ZnS\). Therefore, Sphalerite corresponds to (i).

So, the correct matching is:

List-I	List-II
(a) Calamine	(iii) ZnCO3
(b) Malachite	(iv) CuCO3·Cu(OH)2
(c) Siderite	(ii) FeCO3
(d) Sphalerite	(i) ZnS

Thus, the correct answer is (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i). This corresponds to the second option in the given answers.