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Question

The crystalline form of borax has:
  1. Tetranuclear [B4O5(OH)4]2 unit
  2. All boron atoms in the same plane
  3. Equal number of sp2 and sp3 hybridized boron atoms
  4. One terminal hydroxide per boron atom

A
Tetranuclear [B4O5(OH)4]2 unit
B
All boron atoms in the same plane
C
Equal number of sp2 and sp3 hybridized boron atoms
D
One terminal hydroxide per boron atom
Solution
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The correct options are
A Tetranuclear [B4O5(OH)4]2 unit
C Equal number of sp2 and sp3 hybridized boron atoms
D One terminal hydroxide per boron atom
Correct formula of borax is Na2[B4O5(OH)4].8H2O.

Borax has tetranuclear. [B4O5(OH)4]2 unit.

Only two B atom lies in the same plane.

Two Boron are sp2 & two are sp3 hybridised.

One terminal hydroxide is present per boron atom.

Hence, options A, C and D are correct.

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