Coagulating fine sand particles in muddy water using alum is called _________.

Filtration

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Decantation

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Sieving

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Solution

The correct option is C Loading
$∙$ The process of bringing about very fine solid particles in a liquid to settle faster by adding a special chemical called coagulant is called loading or coagulation.
$∙$ Alum is added to muddy water to coagulate mud particles and settle them at the bottom. Hence, it is an example of loading.

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