Statement-`1`: Water is considered unsuitable for use in thermometers.
Statement-`2`: Thermal Expansion of water is non uniform.

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 correct explanation 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**: Water is considered unsuitable for use in thermometers.
**Statement 2**: Thermal expansion of water is non-uniform.

### Step-by-Step Solution:

1. **Understanding Thermometers**:
- A thermometer is a device used to measure temperature. It typically contains a liquid (like mercury) that expands and rises in a capillary tube as the temperature increases.

**Hint**: Recall the basic working principle of a thermometer and the properties of the liquid used inside it.

2. **Evaluating Statement 1**:
- Water has a very limited temperature range in which it remains in liquid form (0°C to 100°C). Below 0°C, it freezes into ice, and above 100°C, it turns into steam. This makes water unsuitable for measuring temperatures outside this range.

**Hint**: Consider the physical state of water at various temperatures and how that affects its usability in thermometers.

3. **Evaluating Statement 2**:
- The thermal expansion of water is indeed non-uniform. Water expands differently at different temperatures, particularly around 4°C, where it actually contracts instead of expanding. This non-uniform expansion can lead to inaccuracies in temperature readings.

**Hint**: Think about how different substances expand when heated and how this can affect measurement.

4. **Connecting the Statements**:
- Since water's thermal expansion is non-uniform, it can lead to unreliable readings in a thermometer. This supports the idea that water is unsuitable for use in thermometers.

**Hint**: Reflect on how the properties of a liquid influence its effectiveness in a measuring device.

5. **Conclusion**:
- Both statements are true, and Statement 2 provides a correct explanation for Statement 1. Therefore, the answer is that both statements are true, and Statement 2 is the correct explanation for Statement 1.

**Final Answer**: Both Statement 1 and Statement 2 are true, and Statement 2 is the correct explanation of Statement 1.