During the Contact process for the manufacture of sulphuric acid, sulfur trioxide () is absorbed in concentrated to form a dense, fuming liquid called Oleum. What is the chemical formula of Oleum?

Question

During the Contact process for the manufacture of sulphuric acid, sulfur trioxide ($SO_3$) is absorbed in concentrated $H_2SO_4$ to form a dense, fuming liquid called Oleum. What is the chemical formula of Oleum?

Prashant Kotian · Accepted Answer

Correct answer: B. Oleum, also known as fuming sulphuric acid or pyrosulphuric acid, is formed by absorbing gas in concentrated . Its formula is .

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