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CGP EDU Academic Team
Published on: August 14, 2026
In the manufacture of sulphuric acid by the contact process, sulphur trioxide is not directly dissolved in water. Why ?
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SO 3 reacts with water to form H 2 SO 4 which forms a mist that is difficult to condense. It escapes in the atmosphere. It is, therefore, absorbed in conc. H 2 SO 4 to form oleum which may be diluted to form H 2 SO 4 .
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