Assertion (A): Burning of candle is a physical change.
Reason (R ): In physical change, no new substance is formed.

Options

A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is NOT the correct explanation of A.
C. A is true but R is false.
D. A is false and R is true.

Explanation

To solve the assertion-reason question, we will analyze both the assertion and the reason step by step.

### Step 1: Analyze the Assertion
- **Assertion (A)**: "Burning of candle is a physical change."
- **Explanation**: A physical change is defined as a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in shape, size, color, and state (e.g., melting, freezing).

### Step 2: Determine the Nature of Candle Burning
- When a candle burns, the wax (which is a hydrocarbon) melts and reacts with oxygen in the air.
- The chemical reaction that occurs during the burning of a candle produces new substances: carbon dioxide, water vapor, and heat.
- Therefore, the burning of a candle involves a chemical change, not a physical change.

### Step 3: Conclusion on Assertion
- Since burning a candle produces new substances, the assertion that "burning of candle is a physical change" is **incorrect**.

### Step 4: Analyze the Reason
- **Reason (R)**: "In physical change, no new substance is formed."
- **Explanation**: This statement is true. In a physical change, the original substance may change its form or state, but its chemical composition remains the same, meaning no new substances are formed.

### Step 5: Conclusion on Reason
- The reason provided is correct. In physical changes, no new substances are formed.

### Final Conclusion
- The assertion is false (A is incorrect), while the reason is true (R is correct).
- Therefore, the correct answer is that A is false and R is true.

### Summary of the Solution
- Assertion (A): False (burning of candle is a chemical change).
- Reason (R): True (in physical change, no new substance is formed).