Which of the following oxides exists as trigonal planar molecule in gaseous state and a cyclic trimer in the solid state ?
A. `SO_2`
B. `SeO_2`
C. `SO_3`
D. `SeO_3`

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1 Answers

Correct Answer - C
`SO_3` is trigonal in the gaseous state but in solid state it exists as cyclic trimer.

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