Q.

The trioxides which can exist as monomeric molecule is

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a

SO3 in gaseous state

b

TeO3

c

SO3 in solid state

d

SeO3

answer is A.

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Detailed Solution

Sulfur trioxide can exist in both monomeric and polymeric forms. In the gaseous and liquid state, pure SO3​ is an equilibrium mixture of monomeric SO3 and trimeric S3​O9​.In solid state it exists as monomeric SO3​.
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