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JAMB Chemistry 2008 Question 13

Question 13

Water

In the course of purifying water for town supply, the water is passed through large settling tanks containing sodium aluminate (III) to remove

  1. A.large particles
  2. B.germs
  3. C.fine particles
  4. D.odour.
Show the answer and explanation

Answer: C (fine particles)

Explanation

Sodium aluminate forms a sticky aluminium hydroxide floc that traps tiny suspended particles so they settle out (coagulation). Germs are killed later by chlorination.