JAMB Chemistry 2021 Objective — Question 9
Question 9 of 41 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2021 Objective paper, with the correct answer and a full explanation.
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Which of the following is true about the bleaching action of chlorine and sulphur(iv) oxide?
- A. Chlorine bleaches by reduction while SO₂ bleaches by oxidation
- B. SO₂ bleaches by oxidation while chlorine bleaches by reduction
- C. Chlorine bleaches by oxidation while SO₂ bleaches by reductionCorrect
- D. Water is not required while bleaching with Cl₂
Explanation
Cl₂ bleaches by oxidation (oxidises coloured matter). SO₂ bleaches by reduction. Both require water. Cl₂ bleaching is permanent; SO₂ bleaching can be reversed by atmospheric oxidation.
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