The pair having oxide and carbonate ore respectively

Options

A. Chromite, Pyrolusite
B. Cassiterite, Calamine
C. Haematite, Galena
D. Malachite, Bauxite

Answer

To solve the question regarding the pair having oxide and carbonate ores respectively, we will analyze the given options one by one.

### Step-by-Step Solution:

1. **Identify the ores and their formulas from the options:**
- **Option 1:** Chromite (Cr2FeO4) and Pyrolusite (MnO2)
- **Option 2:** Cassiterite (SnO2) and Calamine (ZnCO3)
- **Option 3:** Hematite (Fe2O3) and Galena (PbS)
- **Option 4:** Malachite (Cu2CO3(OH)2) and Bauxite (Al2O3·2H2O)

2. **Classify each ore as either an oxide or a carbonate:**
- **Chromite (Cr2FeO4)** is an oxide ore.
- **Pyrolusite (MnO2)** is also an oxide ore.
- **Cassiterite (SnO2)** is an oxide ore.
- **Calamine (ZnCO3)** is a carbonate ore.
- **Hematite (Fe2O3)** is an oxide ore.
- **Galena (PbS)** is a sulfide ore.
- **Malachite (Cu2CO3(OH)2)** is a carbonate ore.
- **Bauxite (Al2O3·2H2O)** is an oxide ore.

3. **Match the pairs to find one that has one oxide and one carbonate:**
- **Option 1:** Both are oxides (Chromite and Pyrolusite).
- **Option 2:** One is an oxide (Cassiterite) and the other is a carbonate (Calamine).
- **Option 3:** One is an oxide (Hematite) and the other is a sulfide (Galena).
- **Option 4:** One is a carbonate (Malachite) and the other is an oxide (Bauxite).

4. **Conclusion:**
- The only option that contains one oxide and one carbonate ore is **Option 2: Cassiterite (SnO2) and Calamine (ZnCO3)**.

### Final Answer:
The pair having oxide and carbonate ores respectively is **Option 2: Cassiterite and Calamine**.