Which is (are) not an ore ?

Options

A. Bauxite
B. Zinc blende
C. Pig iron
D. Wrought iron

Explanation

To determine which substances are not ores from the given options, we can analyze each option step by step.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- a) Bauxite
- b) Zinc blend
- c) Pig iron
- d) Wrought iron

2. **Analyze Bauxite**:
- Bauxite is known to be an ore of aluminum. Its chemical formula is Al2O3·2H2O.
- **Conclusion**: Bauxite is an ore.

3. **Analyze Zinc Blend**:
- Zinc blend, also known as zinc sulfide (ZnS), is the primary ore of zinc.
- **Conclusion**: Zinc blend is an ore.

4. **Analyze Pig Iron**:
- Pig iron is not an ore; it is an intermediate product of smelting iron ore. It is impure iron that contains a high carbon content.
- **Conclusion**: Pig iron is not an ore.

5. **Analyze Wrought Iron**:
- Wrought iron is a refined form of iron that is known for its malleability and ductility. It is considered the purest commercial form of iron but is not an ore.
- **Conclusion**: Wrought iron is not an ore.

6. **Final Conclusion**:
- Based on the analysis, the substances that are not ores are:
- c) Pig iron
- d) Wrought iron

### Answer:
The substances that are not ores are **Pig iron and Wrought iron** (options c and d).

---