Which chemical is added during the sedimentation step to allow settling of floating particles in water?

Lime

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Charcoal

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Alum

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Iron

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Solution

The correct option is C
Alum

During sedimentation, chemicals such as alum are added to the water. This allows the particles floating in the water to stick together and form lump and thereby settle to the bottom of the tank.

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A chemical added to water during its purification to load the lighter particles.

Loading is the process of adding chemical to a solution during sedimentation.

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