Statement-1: The size of a hydrogen increases as it rises in air.
Statement-2: The material of the balloon can be easily stretched.

Options

A. Statement-1, is true, Statement-2 is true, Statement-2 is correct explanation for statement-1
B. Statement-1 is true, statement-2 is true, statement-2 is NOT a correct explantion for statement-1
C. statement-1 is true, statement-2 is false
D. statement-1 is false statement-2 is true

Answer

To solve the question, we need to analyze both statements provided:

**Statement-1:** The size of hydrogen increases as it rises in air.
**Statement-2:** The material of the balloon can be easily stretched.

### Step-by-Step Solution:

1. **Understanding Statement-1:**
- As hydrogen rises in the atmosphere, it experiences a decrease in air pressure. According to the ideal gas law, when the pressure decreases, the volume of a gas increases if the temperature remains constant.
- Therefore, as hydrogen rises, it expands due to the lower pressure at higher altitudes. This means that Statement-1 is correct.

2. **Understanding Statement-2:**
- The material of the balloon is typically made from elastic materials like rubber or latex, which can be stretched easily. This property allows the balloon to expand as the gas inside it (in this case, hydrogen) increases in volume.
- Hence, Statement-2 is also correct as it describes the property of the balloon material.

3. **Evaluating the Relationship Between the Statements:**
- While both statements are correct, Statement-2 does not provide a correct explanation for Statement-1. Statement-1 is about the behavior of hydrogen gas in response to pressure changes, while Statement-2 is about the material properties of the balloon.
- Therefore, we conclude that both statements are correct, but Statement-2 is not a correct explanation for Statement-1.

4. **Final Conclusion:**
- The correct option is that both statements are true, but Statement-2 is not the correct explanation for Statement-1.

### Final Answer:
Both Statement-1 and Statement-2 are correct, but Statement-2 is not a correct explanation for Statement-1.