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Q.

 Oleum or fuming H2SO4 is

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a

Sulphuric acid saturated with sulphur trioxide, i.e., H2 S2O7

b

A mixture of sulphuric acid and nitric acid

c

Sulphuric acid which gives fumes of sulphur dioxide

d

A mixture of conc. H2SO4 and oil

answer is C.

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Detailed Solution

Pure SO3 obtained is absorbed in 98% conc. H2SO4 to form oleum, which is also called pyrosulphuric acid H2 S2O7.

Hence oleum is prepared by saturating sulphuric acid with sulphur trioxide.

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