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The crystalline form of borax has...

The crystalline form of borax has

A

Tetranuclear `[B_(4)O_(5)(OH)_(4)]^(2-)` units

B

All boron atoms in the same plane

C

Equal number of `sp^(2)` and `sp^(3)` hybridized boron atoms

D

One terminal hydroxide per boron atom

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The correct Answer is:
A, C, D
The structure of anion of borax is
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