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Which of the following species has a pyramidal geometry?

1. SO3
2. BrF3
3. SiO3--
4. OSF2

Correct answer: OSF2

Solution

OSF2 (thionyl fluoride) has S with one lone pair and three bonded atoms (one O, two F), giving an AX3E arrangement which is pyramidal. SO3 is trigonal planar, BrF3 is T-shaped, and SiO3-- is trigonal planar.

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