JAMB Chemistry 2025 Objective — Question 39
Question 39 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2025 Objective paper, with the correct answer and a full explanation.
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In the contact process, SO₃ is absorbed in conc. H₂SO₄ rather than in water because
- A. The reaction with water is endothermic
- B. The reaction with water is too violent and produces a mistCorrect
- C. Water does not react with SO₃
- D. SO₃ decomposes in water
Explanation
SO₃ + H₂O → H₂SO₄ is violently exothermic and produces a fine acid mist. SO₃ is first absorbed in conc. H₂SO₄ to form oleum (H₂S₂O₇), then diluted carefully.
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