During the purification of water, the large insoluble solid impurities are allowed to settle down at the bottom. This process is known as __________.

sedimentation

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filtration

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chlorination

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crystallisation

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Solution

The correct option is A sedimentation

Sedimentation is the process by which the large insoluble solid particles are allowed to settle down at the bottom.

Crystallisation is a process, by which pure solids are obtained in the form of crystals from its solution.

Filtration is the process in which the insoluble solid particles in a liquid are removed by using filter medium, that allows the liquid to pass through it but the insoluble solid particles are left behind.

Chlorination is the process by which bacteria present in water are killed, so that water becomes fit for drinking.

Therefore, the answer is sedimentation.

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