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In the preparation of $\mathrm{H}_2 \mathrm{SO}_4$ by Contact process, why is $\mathrm{SO}_3$ not absorbed directly in water to form $\mathrm{H}_2 \mathrm{SO}_4$ ?
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In Contact process $\mathrm{SO}_3$ is not absorbed directly in water to from $\mathrm{H}_2 \mathrm{SO}_4$ because the reaction is highly exothermic, and acid mist is formed. Hence, the reaction becomes difficult to handle.
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