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JAMB Chemistry 2001 Question 20

Question 20

Water

The chemical used for coagulation in water purification is

  1. A.aluminium tetraoxosulphate (VI)
  2. B.copper tetraoxosulphate (VI)
  3. C.sodium tetraoxosulphate (VI)
  4. D.calcium tetraoxosulphate (VI)
Show the answer and explanation

Answer: A (aluminium tetraoxosulphate (VI))

Explanation

Alum (aluminium tetraoxosulphate (VI)) makes fine suspended particles clump together so that they settle and can be removed.