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MolSynapse / Question bank / p-Block Elements: Groups 15 and 16 / Sulphur allotropes, SO2, sulphuric acid, oxyacids of sulphur
JEE Main levelSingle correct optionDifficulty 2 of 3pn154

In the contact process, is absorbed in concentrated sulphuric acid and not directly in water because

  1. Adirect absorption in water forms a fine mist of droplets that is difficult to condense
  2. Bwater is a catalyst poison
  3. C does not react with water
  4. Dthe reaction with water is endothermic

Answer: A

The reaction of SO3 with water is highly exothermic and produces a persistent acid fog. SO3 is instead dissolved in 98% H2SO4 to form oleum, , which is diluted to the required strength.
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