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The crystalline form of borax has

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Tetranuclear ${[B_{4} O_{5} {(O H)}_{4}]}^{2 -} u n i t$

All boron atoms in the same plane

equal number of $s p^{2} and s p^{3}$ hybridized boron atoms

one terminal hydroxide per boron atom

answer is A.

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Detailed Solution

[B4O5(OH)4]²⁻

This is the structure of the tetraborate anion (commonly known as part of borax, Na2B4O7·10H2O).

It consists of:

4 boron (B) atoms
5 oxygen (O) atoms in bridging positions
4 hydroxyl (–OH) groups
Overall charge: 2⁻

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