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Which of the mentioned is the formula of Oleum?

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Which of the mentioned is the formula of Oleum?

(a) H2S2O8

(b) H2S2O6

(c) H2S2O7

(d) H2S2O5

The question was posed to me during an online exam.

I'm obligated to ask this question of Inorganic Chemicals in section Chemical Industries of Chemical Technology

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Right option is (c) H2S2O7

The explanation is: Oleum – (H2SO4+SO3) which on summing up the like compounds will give H2S2O7.

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