The crystalline form of borax has :

Tetranuclear

{[B_{4} O_{5} {(O H)}_{4}]}^{2 -}

unit

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All boron atoms in the same plane

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Equal number of

{s p}^{2}

and

{s p}^{3}

hybridized boron atoms

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One terminal hydroxide per boron atom

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Solution

The correct options are
A Tetranuclear ${[B_{4} O_{5} {(O H)}_{4}]}^{2 -}$ unit
C Equal number of ${s p}^{2}$ and ${s p}^{3}$ hybridized boron atoms
D One terminal hydroxide per boron atom
Correct formula of borax is $N a_{2} [B_{4} O_{5} (O H)_{4}] .8 H_{2} O$ .

Borax has tetranuclear. $[B_{4} O_{5} (O H)_{4}]^{2 -}$ unit.

Only two B atom lies in the same plane.

Two Boron are $s p^{2}$ & two are $s p^{3}$ hybridised.

One terminal hydroxide is present per boron atom.

Hence, options $A$ , $C$ and $D$ are correct.

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