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Question

Purest form of Solid Sulphur trioxide exists as:

A
Dimer
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B
Trimer
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C
Both a and b
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D
None of these
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Solution

The correct option is B Trimer
The structure of solid SO3 is surprisingly complex. When the gas is condensed into absolutely pure solid form, the compound exists as a trimer.

Now what would be the geometry of the of the each of the elements in the six-membered ring?
This ice-like pure (SO3)3 is called γ - SO3 Other crystalline forms of solid (of course!!) SO3 exists as well.
They might be long-chain solid polymeric compounds of the form HO(SO3)nOH such that n is a very big number like 105.

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