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In which one of the following species the central atom has the type of hybridization which is not the same as that present in the other three?

1. SF4
2. I3−
3. SbCl52−
4. PCl5

Correct answer: I3−

Solution

SF4, SbCl52−, and PCl5 all have sp3d hybridization, while I3− has sp3d2 hybridization due to its linear geometry and involvement of d-orbitals in an expanded octet.

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