The burning of candle is a `"_____"` change.

Options

A. Perioic and irreversible
B. Reversible and chemical
C. Non-periodic and reversible
D. Chemical and irreversible

Answer

To determine the type of change that occurs when a candle burns, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Process**: The process in question is the burning of a candle.

2. **Understand the Nature of the Change**: When a candle burns, it undergoes a transformation. The wax (which is primarily made of hydrocarbons) reacts with oxygen in the air.

3. **Chemical Reaction**: During burning, the wax is converted into new substances, primarily carbon dioxide (CO2) and water (H2O), along with heat and light. This indicates that a chemical reaction is taking place.

4. **Irreversibility**: Once the candle wax has burned, it cannot be reverted back to its original form. The products formed (CO2 and H2O) cannot be transformed back into the wax.

5. **Conclusion**: Since the burning of a candle results in the formation of new substances and is irreversible, we classify this change as a **chemical and irreversible change**.

### Final Answer:
The burning of a candle is a **chemical and irreversible** change.

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