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Which of the following species has a pyramidal shape?

1. SO3
2. BrF3
3. SiO3²-
4. OSF2

Correct answer: OSF2

Solution

OSF2 (thionyl fluoride) has sulphur with three bonded atoms (O, F, F) and one lone pair, giving a trigonal pyramidal shape. SO3 and SiO3²- are trigonal planar, and BrF3 is T-shaped.

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