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

Step 1: Understanding the Question:
This question requires matching common ores with their respective chemical formulas. This is based on factual knowledge from the topic of metallurgy.
Step 2: Detailed Explanation:
Let's identify the chemical formula for each ore listed in List-I.
- (a) Calamine: Calamine is a carbonate ore of zinc. Its chemical formula is ZnCO\(_3\). This matches with (iii) in List-II.
- (b) Malachite: Malachite is a basic carbonate ore of copper. Its chemical formula is CuCO\(_3\).Cu(OH)\(_2\). This matches with (iv) in List-II.
- (c) Siderite: Siderite is a carbonate ore of iron. Its chemical formula is FeCO\(_3\). This matches with (ii) in List-II.
- (d) Sphalerite: Sphalerite, also known as Zinc Blende, is a sulfide ore of zinc. Its chemical formula is ZnS. This matches with (i) in List-II.
Step 3: Final Answer:
The correct matching is:
- (a) \(\rightarrow\) (iii)
- (b) \(\rightarrow\) (iv)
- (c) \(\rightarrow\) (ii)
- (d) \(\rightarrow\) (i)
This combination corresponds to option (B).