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Fuming sulphuric acid is the solution of _________% SO3 in conc. H2SO4.

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Fuming sulphuric acid is the solution of _________% SO3 in conc. H2SO4.

(a) 10

(b) 9

(c) 8

(d) 7

This question was addressed to me at a job interview.

My query is from Electrophillic Substitution Reaction topic in portion Reactivity of Molecules Reaction Mechanism of Engineering Chemistry I

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Correct choice is (d) 7

For explanation: Fuming sulphuric acid is the solution of 7% SO3 in conc. H2SO4. It is also called Oleum which is produced in the contact process, where sulphur is oxidized to sulphur trioxide which is subsequently dissolved in concentrated sulphuric acid.

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