A teacher one day pointed out to his students the peculiar fact that water is a unique liquid which freezes exactly at `0^(@)C`.and boils exactly at `100^(@)C`. He asked the students to find the correct statement based on this fact.

Options

A. Water dissolves anything, however sparingly the dissolution maybe.
B. Water is a polar molecule.
C. Boiling and freezing temperatures of water were used to define a temperature scale.
D. Liquid water is denser than ice.

Explanation

To solve the question, we need to analyze the information provided about the freezing and boiling points of water and determine the correct statement based on that fact.

### Step 1: Understand the freezing and boiling points of water
Water freezes at 0°C and boils at 100°C under standard atmospheric pressure (1 atm). This is a fundamental property of water and is used as a reference point in the Celsius temperature scale.

### Step 2: Identify the significance of these points
The freezing point (0°C) and boiling point (100°C) of water are significant because they serve as the defining points for the Celsius temperature scale. This means that the Celsius scale was established based on the behavior of water.

### Step 3: Evaluate the statements
Given that the teacher pointed out the unique properties of water, we need to evaluate the statements provided in the question (which are not explicitly listed here but can be assumed to relate to the properties of water and temperature scales).

### Step 4: Determine the correct statement
Based on the information provided, the correct statement would be one that acknowledges that the freezing and boiling points of water are used to define the Celsius temperature scale. Any statement that contradicts this or provides incorrect information about the properties of water would be incorrect.

### Conclusion
The only correct answer based on the teacher's observation is that the freezing and boiling points of water (0°C and 100°C) are used to define the Celsius temperature scale.

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