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JAMB Chemistry 2005 Question 19

Question 19

Water

When water boilers are used for a long period of time, the solid substances left behind as scale are

  1. A.magnesium trioxosilicate (IV) and rust
  2. B.magnesium trioxosilicate (IV) and calcium tetraoxosulphate (VI)
  3. C.clay and magnesium trioxosulphate (IV)
  4. D.clay and rust
Show the answer and explanation

Answer: B (magnesium trioxosilicate (IV) and calcium tetraoxosulphate (VI))

Explanation

Boiler scale forms from permanently hard water; the deposits are mainly calcium tetraoxosulphate(VI) and magnesium trioxosilicate(IV).