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JAMB Chemistry 1987 Question 13

Question 13

Water

In the purification of town water supply, alum is used principally to

  1. A.kill bacteria
  2. B.control the pH of water
  3. C.improve the taste of the water
  4. D.coagulate small particles of mud.
Show the answer and explanation

Answer: D (coagulate small particles of mud.)

Explanation

Alum makes tiny suspended clay and mud particles clump together (coagulate) so they settle out. Chlorine, not alum, kills bacteria.