Match the ores in List-I with their chemical composition in List II.

Choose the correct answer from the options given below:

(A)-(III), (B)-(I), (C)-(IV), (D)-(II)

The correct answer is option 3. (A)-(III), (B)-(I), (C)-(IV), (D)-(II).

Let's delve into the explanation for each ore and its corresponding chemical composition:

A) Kaolinite: (III) \([Al_2(OH)_4Si_2O_5]\)

Kaolinite is a clay mineral commonly found in soils and sedimentary rocks.

Its chemical composition is given by the formula \([Al_2(OH)_4Si_2O_5]\), which indicates the presence of aluminum (Al), oxygen (O), silicon (Si), and hydroxide (OH) ions.

Kaolinite is primarily composed of aluminum oxide and silicon dioxide, along with water molecules bonded to the structure.

B) Siderite: (I) \(FeCO_3\)

Siderite is an iron carbonate mineral commonly found in sedimentary environments.

Its chemical composition is represented by the formula \(FeCO_3\), indicating the presence of iron (Fe), carbon (C), and oxygen (O).

Siderite is a significant source of iron ore and often occurs in association with other iron-bearing minerals.

C) Malachite: (IV) \(CuCO_3.Cu(OH)_2\)

Malachite is a copper carbonate hydroxide mineral known for its vibrant green color and is commonly found in oxidized copper deposits.

Its chemical formula is \(CuCO_3.Cu(OH)_2\), indicating the presence of copper (Cu), carbon (C), oxygen (O), and hydroxide (OH) ions.

Malachite is an important ore of copper and has been used as a decorative stone for thousands of years due to its striking appearance.

D) Calamine: (II) \(ZnCO_3\)

Calamine is a zinc carbonate mineral found in zinc-rich ore deposits.

Its chemical composition is given by the formula \(ZnCO_3\), indicating the presence of zinc (Zn), carbon (C), and oxygen (O).

Calamine is an important source of zinc ore and is often associated with other zinc-bearing minerals such as sphalerite.

Therefore, the correct match is: 4. (A)-(III), (B)-(II), (C)-(IV), (D)-(I)