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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

coagulation


Explanation for the correct option

Option C: coagulation

Alum

  • Alum is a chemical compound that generally has a hydrated double sulfate salt of aluminum.
  • It is represented by the molecular formula XAl(SO4)2.12H2O where 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 water

  • Alum 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: Dialysis

  • Dialysis 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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