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JAMB Chemistry 1981 Question 32

Question 32

Sulphur and its Compounds

The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are

  1. A.Na2SO4 + SO2 + O2 + H2O
  2. B.Na2SO3 + SO3 + O2 + H2O
  3. C.Na2SO4 + SO2 + S + H2O
  4. D.Na2SO4 + SO3 + S + H2O
  5. E.Na2SO4 + SO2 + H2O only
Show the answer and explanation

Answer: C (Na2SO4 + SO2 + S + H2O)

Explanation

Na2S2O3 + H2SO4 → Na2SO4 + SO2 + S + H2O; the yellow sulphur precipitate is the well-known sign of this reaction.