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Which of the following species has a regular tetrahedral geometry?

1. BF4−
2. SF4
3. XeF4
4. [Ni(CN)4]2−

Correct answer: BF4−

Solution

BF4− has a regular tetrahedral geometry because it has four bonding pairs of electrons and no lone pairs, allowing the electron pairs to be spaced evenly around the central boron atom.

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