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Question
Sulphuric acid is manufactured by the contact process.
Why \[\ce{H2SO4}\] is not obtained by directly reacting \[\ce{SO3}\] with water.
Solution
Sulphuric acid is not obtained directly by reacting \[\ce{SO3}\] with water because the reaction is highly exothermic, which produces the fine misty droplets of sulphuric acid that is not directly absorbed by water.
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