Formation of steam from water on boiling is

Options

A. reversible change
B. irreversible change
C. chemical change
D. undesirable change.

Explanation

To determine the type of change that occurs when steam is formed from water upon boiling, we can analyze the process step by step:

### Step-by-Step Solution:

1. **Understanding the Initial State**:
- Water is present in a liquid state before boiling.

**Hint**: Identify the state of matter before the change occurs.

2. **Boiling Process**:
- When water is heated to its boiling point, it undergoes a transformation from liquid to gas. This gas is known as steam.

**Hint**: Consider what happens to the molecules of water when heat is applied.

3. **Change Type Analysis**:
- The change from liquid water to steam is a physical change, not a chemical change. This is because the chemical composition of water (H₂O) remains the same; only its state changes.

**Hint**: Remember that a chemical change results in the formation of new substances, while a physical change does not.

4. **Reversibility of the Change**:
- The steam can be condensed back into water when cooled. This means the change is reversible, as the original substance (water) can be obtained again.

**Hint**: Think about whether the process can be reversed to get the original substance back.

5. **Conclusion**:
- Since the change from water to steam can be reversed and does not involve the formation of a new substance, the correct answer is that the formation of steam from water on boiling is a **reversible change**.

### Final Answer:
- The formation of steam from water on boiling is **A) reversible change**.