The purity of water can be checked by:

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Distillation

Crystallisation

Centrifugation

None of the above

answer is D.

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Detailed Solution

Concept- Apure substance has a fixed boiling or melting point and addition of impurities alters the boiling point and melting point.
The boiling point of a liquid is the temperature at which the liquid's vapour pressure equals the air pressure.
Every substance has its own boiling point, the point at which it transitions from a liquid to a gaseous form. At 100 degrees Celsius, pure water (water without any contaminants) boils.
The dissolved salt in impure water changes the temperature of the boiling point. The boiling point of water increases as the amount of dissolved salt in the water increases.
Therefore, the purity of water can be checked by checking the boiling point of the water.
Hence, option 4 is the correct answer.

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