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BO3^(3-) has trigonal planar structure-w...

`BO_3^(3-)` has trigonal planar structure-why?

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The three half-filled orbitals `(2s, 2p_x, and 2p_y)` of boron in its excited state undergo `sp^2`- hybridisation. The resulting three `sp^2` - hybridised orbitals overlap with `2p^(-)` orbitals of three `O^(-)` forming three B - `O^(-)` bonds. Thus, `BO_3^(3-)` ion has trigonal planar structure .
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