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JAMB Chemistry 1999 Question 34

Question 34

Sulphur and its Compounds

The salt that reacts with dilute hydrochloric acid to produce a pungent smelling gas which decolourizes acidified purple potassium tetraoxomanganate (VII) solution is

  1. A.Na2SO4
  2. B.Na2SO3
  3. C.Na2S
  4. D.Na2CO3.
Show the answer and explanation

Answer: B (Na2SO3)

Explanation

Sodium trioxosulphate(IV) reacts with dilute acid to give sulphur(IV) oxide, a choking gas that reduces purple KMnO4 to colourless Mn2+.