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Describe the shapes of BF3 and BF4^...

Describe the shapes of `BF_3` and `BF_4^_`

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In `BF_3`, B atom is `sp^2` hybridised and so `BF_3` is trigonal planar.
In `BF_4^-`,B atom is `sp^3` hybridised and `BF_4^-` attains, tetrahedral geometry.
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