Which of the following is a chemical change?

Options

A. Magnetisation of iron
B. Melting of ice
C. Burning of sulphur
D. Melting of wax

Answer

To determine which of the following is a chemical change, we will analyze each option provided.

### Step-by-Step Solution:

1. **Identify the Options**: We have four options to consider:
- Option 1: Magnetization of Iron
- Option 2: Melting of Ice
- Option 3: Burning of Sulphur
- Option 4: Melting of Wax

2. **Analyze Option 1: Magnetization of Iron**:
- In this process, iron acquires magnetic properties.
- However, no new substance is formed; it is still iron, just with a different property.
- **Conclusion**: This is NOT a chemical change.

3. **Analyze Option 2: Melting of Ice**:
- Melting ice changes its state from solid to liquid (water).
- Although a phase change occurs, the substance remains H2O (water) in both states.
- **Conclusion**: This is NOT a chemical change.

4. **Analyze Option 3: Burning of Sulphur**:
- When sulphur is burned, it reacts with oxygen to form sulfur dioxide (SO2).
- This process results in the formation of a new substance (sulfur dioxide).
- **Conclusion**: This IS a chemical change.

5. **Analyze Option 4: Melting of Wax**:
- Melting wax changes its state from solid to liquid.
- Similar to melting ice, the substance remains wax and can solidify back into its original form.
- **Conclusion**: This is NOT a chemical change.

6. **Final Answer**:
- The only option that represents a chemical change is **Option 3: Burning of Sulphur**.