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What is the chemical formula of Oleum?

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What is the chemical formula of Oleum?

(a) H2S2O7

(b) H2S2O8

(c) H2S2O9

(d) H2S2O10

The question was posed to me by my school teacher while I was bunking the class.

My enquiry is from Inorganic Chemical in portion Inorganic Chemical Industries of Chemical Technology

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Correct answer is (a) H2S2O7

To explain: Chemical formula of Oleum is H2SO4 + SO3, which is H2S2O7.

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