Question

Matter can change its physical state depending on temperature. What happens if water is allowed to cool?

• A. Water vapour changes into water.
• B. Water changes into water vapour.
• C. Water changes from solid state into liquid state.
• D. Water changes from liquid state to solid state.

Answer 1

The correct option is D

Water changes from liquid state to solid state.

1. When a liquid is cooled by lowering its temperature, its particles lose energy due to which they move slowly.
2. If the liquid is cooled enough up to its freezing point, its particle stops moving and vibrates about a fixed position.
3. At this stage the liquid freezes and becomes a solid.
4. Thus, if water is allowed to cool, it changes from the liquid state to the solid-state.

Hence, option D is the correct answer.