Statement-1: Gas thermometers are more sensitive than liquid thermometers.
Statement-2: Coefficient of thermal expansion of gases is more than liquid.

Options

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

Explanation

To analyze the statements regarding gas thermometers and liquid thermometers, we need to evaluate both statements and their relationship.

### Step-by-Step Solution:

1. **Understanding Gas and Liquid Thermometers**:
- Gas thermometers use the expansion of gas to measure temperature, while liquid thermometers (like mercury thermometers) use the expansion of liquid (mercury or alcohol).
- The sensitivity of a thermometer is determined by how much the substance expands with a change in temperature.

**Hint**: Consider how different states of matter respond to temperature changes.

2. **Thermal Expansion**:
- When heated, solids expand the least, liquids expand more than solids, and gases expand the most.
- This means that for a given temperature change, gases will show a larger change in volume compared to liquids.

**Hint**: Recall the general trend of thermal expansion in solids, liquids, and gases.

3. **Evaluating Statement 1**:
- Statement 1 claims that gas thermometers are more sensitive than liquid thermometers.
- Since gases expand more than liquids for the same temperature change, gas thermometers will indeed be more sensitive.

**Hint**: Think about how sensitivity relates to the amount of expansion per degree of temperature change.

4. **Evaluating Statement 2**:
- Statement 2 states that the coefficient of thermal expansion of gas is greater than that of liquid.
- The coefficient of thermal expansion for gases is indeed higher than that for liquids, which supports the first statement.

**Hint**: Remember that the coefficient of thermal expansion quantifies how much a substance expands per degree of temperature change.

5. **Conclusion**:
- Both statements are correct. Statement 2 provides a valid explanation for why gas thermometers are more sensitive than liquid thermometers.
- Therefore, we conclude that both statements are true, and Statement 2 is a correct explanation for Statement 1.

### Final Answer:
Both Statement 1 and Statement 2 are true, and Statement 2 is a correct explanation for Statement 1.

### Answer Option:
- Option A: Both statements are true, and Statement 2 is the correct explanation for Statement 1.