In a kerosene wick stove, kersosene first gets vaporised (Change X) and then kerosene vapours burn to produce flame (Change Y).
What type of changes X and Y are?

Options

A. X - Chemical change, Y-Reversible change
B. X - Physical change, Y-Chemical change
C. X-Chemical change. Y - Physical change
D. X-Reversible change, Y- Physical change

Explanation

To solve the question regarding the types of changes in a kerosene wick stove, we will analyze the two processes described: the vaporization of kerosene and the burning of kerosene vapors.

### Step-by-Step Solution:

1. **Identify Change X**:
- Change X refers to the process where kerosene is vaporized. This means that the liquid kerosene is converted into its gaseous form (vapors).
- **Hint**: Think about what happens to the state of a substance when it changes from liquid to gas.

2. **Determine the Nature of Change X**:
- Vaporization is a change of state. The chemical composition of kerosene remains the same; only its physical state changes from liquid to gas.
- **Hint**: Remember that changes of state (like melting, freezing, vaporization) are typically classified as physical changes.

3. **Identify Change Y**:
- Change Y refers to the burning of kerosene vapors, which produces a flame.
- **Hint**: Consider what happens when a substance burns. Does it retain its original chemical structure?

4. **Determine the Nature of Change Y**:
- Burning is a chemical reaction where the kerosene vapors react with oxygen, resulting in new substances (like carbon dioxide and water). Therefore, the chemical composition changes.
- **Hint**: Any process that results in the formation of new substances is classified as a chemical change.

5. **Conclusion**:
- Change X (vaporization of kerosene) is a **physical change**.
- Change Y (burning of kerosene vapors) is a **chemical change**.

### Final Answer:
- Change X is a physical change.
- Change Y is a chemical change.