Sulphur trioxide is not directly dissolved in water to form sulphuric acid because

Chemistry · Class 12 · CBSE — The p-Block Elements

1. SO₃ does not react with water to form acid
2. SO₃ gets oxidised to H₂SO₃ when dissolved in water
3. it results in the formation of dense fog of sulphuric acid which is difficult to condense
4. sulphur trioxide is insoluble in water due to its covalent nature.

Answer

(C) it results in the formation of dense fog of sulphuric acid which is difficult to condense

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