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total number of Boron atoms in anionic p...

total number of Boron atoms in anionic part of borax which participate in back bonding.

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The correct Answer is:
2
Borax: `2Na^(+)[B_(4)O_(5)(OH)_(4)]^(2-).8H_(2)O`

`sp^(2)`-hybridized boron atoms only participate in `p pi- p pi` back bonding.
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