Multiple choice

What is the reason for using alum for purifying the water?

  1. It forms complex with clay particles.

  2. It coagulates the mud particles.

  3. It exchanges Ca2+ and Mg2+ ions present in hard water.

  4. Its sulphate ion is a water purifier.

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mud is colloidal charged solution which on treatment with Alum (Al3+) gets neutralised or coagulated.

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