Pick out the wrong statement?

A. The chemical formula of oleum is H2S2O7, which is formed by saturating sulphuric acid with

B. Vitriol oil is nothing but technical sulphuric acid

C. phur trioxide

D. Conversion of SO2 to SO3 in Monsanto-4 pass converter is about 98%

E. Decomposition of sulphuric acid on heating does not start before its boiling

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