Animated Solution for Chemistry - Metallurgy: Match List-I with List-II. $\begin{array}{ll}\text{List I (Metal)}& \text{List II (Ores)}\\ \text{A. Aluminium}& \text{1. Siderite}\\ \text{B. Iron}& \text{2. Calamine}\\ \text{C. Copper}& \text{3. Kaolinite}\\ \text{D. Zinc}& \text{4. Malachite}\end{array}$ Choose the correct answer from the options given below.

Welcome to a fascinating journey into the world of metallurgy! Today, we are going to tackle a classic matching problem that tests our knowledge of metals and their naturally occurring ores. This isn't just about memorizing names; it's about understanding the chemical identity of the earth's hidden treasures.

We are presented with four essential metals: Aluminium, Iron, Copper, and Zinc. Our mission is to pair them correctly with four famous ores: Siderite, Calamine, Kaolinite, and Malachite. Let's dive into the chemistry of each one and uncover their secrets.

The Clay Connection

Let's start with Aluminium, one of the most abundant metals in the Earth's crust. When we look at our list of ores, Kaolinite stands out.

Kaolinite is a beautiful, white clay mineral. It is an aluminosilicate with the chemical formula ${\text{Al}}_2(\text{OH}{)}_4{\text{Si}}_2{\text{O}}_5$. While bauxite is the primary commercial ore for extracting aluminium, kaolinite is a very significant mineral that contains a high percentage of aluminium.

Imagine the soft clay used to make fine porcelain and ceramics; that's kaolinite! Because of its high aluminium content, it perfectly matches with Aluminium. Therefore, we can confidently say that A matches with 3.

Next up is Iron, the backbone of modern infrastructure. Among the remaining options, we have Siderite, Calamine, and Malachite.

Siderite is a very well-known ore of iron. Unlike haematite or magnetite, which are oxide ores, siderite is a carbonate ore. Its chemical formula is ${\text{FeCO}}_3$.

Siderite is often found in sedimentary rocks and has a yellowish-brown color. In the blast furnace, siderite is first calcined to convert it into iron oxide before it is reduced to metallic iron. Knowing this, we can easily pair Iron with Siderite. Thus, B matches with 1.

Now, let's talk about Copper. Copper ores are often incredibly colorful, and Malachite is no exception.

Malachite is a stunning, vibrant green mineral that has been used as a gemstone and pigment for thousands of years. Chemically, it is a basic copper carbonate with the formula ${\text{CuCO}}_3\cdot \text{Cu}(\text{OH}{)}_2$.

If you've ever seen the green patina that forms on old copper roofs or statues (like the Statue of Liberty), you've seen a substance very similar to malachite! This distinctive green mineral is a classic ore of copper. So, C matches with 4.

Finally, we are left with Zinc and the ore Calamine.

You might recognize the word "calamine" from calamine lotion, which is used to soothe skin irritations. In metallurgy, calamine refers to a zinc carbonate ore with the chemical formula ${\text{ZnCO}}_3$. (Note: In some parts of the world, this mineral is also called smithsonite).

Calamine is a crucial source of zinc. During extraction, it is heated (calcined) to drive off carbon dioxide, leaving behind zinc oxide, which is then reduced to pure zinc metal. This confirms our final pairing: D matches with 2.

Let's review our logical deductions: - Aluminium (A) pairs with Kaolinite (3). - Iron (B) pairs with Siderite (1). - Copper (C) pairs with Malachite (4). - Zinc (D) pairs with Calamine (2).

This gives us the sequence: A $\to$ 3, B $\to$ 1, C $\to$ 4, D $\to$ 2.

When we look at the given options, this exact sequence corresponds perfectly to option (d).

By understanding the chemical formulas and properties of these minerals, we didn't just guess the answer; we derived it through solid chemical principles. Keep exploring the fascinating world of ores, and you'll find that every rock has a story to tell!