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Question

In the contact process, SO3 is dissolved in concentrated Sulphuric acid to produce:


A

Fuming Sulphuric acid

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B

Pyrosulphuric acid

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C

Oleum

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D

H2S2O7

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Solution

The correct option is D

H2S2O7


H2SO4(I)+SO3(g)H2S2O7(I)

Oleum, the product on the right hand side is also knows as fuming sulphuric acid. It has other names – pyrosulphuric acid or disulphuric acid.

It has the following structure:

Each Sulphur atom is sp3 hybridized as per VSEPR theory. Also, Sulphur retains its +6 oxidation much like in the case of the sulphate ion, Sulphuric acid and SO3.


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