Which of the following pair consists of ore of the same metal ?

Options

A. Bauxite, Limonite
B. Haematite,Siderite
C. Cinnabar, Cassiterite
D. Galena, Cerrusite

Answer

To determine which pair consists of ores of the same metal, we will analyze each option one by one.

### Step 1: Analyze the first pair - Bauxite and Limonite
- **Bauxite**: The chemical formula is Al₂O₃·2H₂O. It is an ore of **aluminum**.
- **Limonite**: The chemical formula is FeO(OH)·nH₂O. It is an ore of **iron**.

**Conclusion**: Bauxite and Limonite are not ores of the same metal.

### Step 2: Analyze the second pair - Hematite and Cedrite
- **Hematite**: The chemical formula is Fe₂O₃. It is an ore of **iron**.
- **Cedrite**: The chemical formula is FeCO₃. It is also an ore of **iron**.

**Conclusion**: Hematite and Cedrite are both ores of the same metal (iron).

### Step 3: Analyze the third pair - Cinnabar and Cassiterite
- **Cinnabar**: The chemical formula is HgS. It is an ore of **mercury**.
- **Cassiterite**: The chemical formula is SnO₂. It is an ore of **tin**.

**Conclusion**: Cinnabar and Cassiterite are not ores of the same metal.

### Step 4: Analyze the fourth pair - Galena and Cerusite
- **Galena**: The chemical formula is PbS. It is an ore of **lead**.
- **Cerusite**: The chemical formula is PbCO₃. It is also an ore of **lead**.

**Conclusion**: Galena and Cerusite are both ores of the same metal (lead).

### Final Answer
The pairs that consist of ores of the same metal are:
- **Second Pair**: Hematite and Cedrite (both are ores of iron).
- **Fourth Pair**: Galena and Cerusite (both are ores of lead).

### Summary
- The correct choices are **Option 2 (Hematite and Cedrite)** and **Option 4 (Galena and Cerusite)**.

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