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JAMB Chemistry 1982 Question 10

Question 10

Sulphur and its Compounds

When copper powder is heated with concentrated sulphuric acid, the gas produced is

  1. A.hydrogen sulphide
  2. B.sulphur dioxide
  3. C.sulphur trioxide
  4. D.hydrogen pentasulphide
  5. E.sulphur pentoxide.
Show the answer and explanation

Answer: B (sulphur dioxide)

Explanation

Hot concentrated sulphuric acid oxidises copper and is itself reduced to sulphur dioxide: Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O.