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What is the name of the following compound: H2S2O7?

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What is the name of the following compound: H2S2O7?

(a) Oleum

(b) Sulfamic acid

(c) Pyrosulfuric acid

(d) Sulfuric acid

This question was addressed to me by my school principal while I was bunking the class.

My doubt is from Chlorosulfonation in chapter Sulfonation and Sulfation of Unit Processes

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The correct option is (c) Pyrosulfuric acid

Best explanation: Sulfamic acid can be prepared by the reaction of urea and pyrosulfuric acid, whose formula is H2S2O7 (pyrosulfuric acid ).

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