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JAMB Chemistry 1979 Question 40

Question 40

Water

Two metallic ions associated with hard water are

  1. A.copper and zinc
  2. B.magnesium and silver
  3. C.calcium and magnesium
  4. D.potassium and tin
  5. E.sodium and lead.
Show the answer and explanation

Answer: C (calcium and magnesium)

Explanation

Water hardness is caused by dissolved calcium and magnesium ions, which form scum with soap.