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JAMB Chemistry 2004 Question 34

Question 34

Sulphur and its Compounds

Sulphur (IV) oxide bleaches by

  1. A.reduction
  2. B.oxidation
  3. C.hydration
  4. D.adsorption
Show the answer and explanation

Answer: A (reduction)

Explanation

In water SO2 removes oxygen from (reduces) the dye to a colourless product; that is why its bleaching can wear off as air re-oxidises the dye.