Question

# Alums purify muddy water by :

A

dialysis

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B

absorption

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C

coagulation

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D

forming true solution

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Solution

## The correct option is C coagulationExplanation for the correct optionOption C: coagulationAlum Alum is a chemical compound that generally has a hydrated double sulfate salt of aluminum. It is represented by the molecular formula $\mathrm{XAl}{\left({\mathrm{SO}}_{4}\right)}_{2}.12{\mathrm{H}}_{2}\mathrm{O}$ where $\mathrm{X}$ denotes a cation which is generally potassium or sodium. Coagulation Coagulation is a process of aggregation or accumulation of colloidal particles to settle down as a precipitate. Action of alum on muddy waterAlum removes the charge from the suspended colloid particles in the solution. This causes the particles to clump together and settle. Hence, the muddy water gets purified. Hence this option is correct. Explanation for incorrect options: Option A: DialysisDialysis is the process of separating molecules in solution by the difference in their rates of diffusion through a semipermeable membrane, such as dialysis tubing. Alum purifies muddy water by the process of coagulation. Hence this option is incorrect. Option B: Absorption Absorption is a physical or chemical process in which atoms, molecules, or ions enter a bulk phase. Alum purifies muddy water by the process of coagulation. Hence this option is incorrect. Option D: Forming true solution A true solution is a mixture of solute and solvent that is homogeneous. Filtration cannot separate the solute from the solution in a true solution.Alum purifies muddy water by the process of coagulation. Hence this option is incorrect.Hence the correct option is C, coagulation.

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