MHT CET 2022 Chemistry question

Which from following activities result in to the formation of oleum in manufacture of sulphuric acid by contact process?

(A)By adding sodium sulphite and SO in water.
(B)By Passing SO gas in to the dil. HSO.
(C)Passing SO gas through NaOH solution.
(D)By absorbing SO gas in conc. HSO.Correct

Answer: (D)

Solution

In the contact process is oxidised to over a catalyst. is not dissolved directly in water because it gives a fine acid mist; instead it is absorbed in concentrated (98%) to give oleum (fuming sulphuric acid):

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Question ID VK-093517