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

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

NTA AbhyasNTA Abhyas 2022

Solution:

Borax $2 Na ^{+}\left[ B _{4} O _{5}\left( OH .8 H _{2} O \right.\right.$
Solution
$sp^{2}$ hybridised boron atoms only participate in $p\pi \text{-p}\pi $ back bonding as they have vacant p-orbitals.