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Question

A student was having a beaker full of muddy water. He put a whitish stone like substance in it and suddenly the mud settled down. What is this white substance and what do we call this process?
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Solution

The white substance is alum (aluminium sulphate). The process is called coagulation or sedimentation. In muddy water, alum forms a gelatinous precipitate which settles down in the bottom.

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