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Which of the following statements correctly describes the structure of crystalline borax?

1. It contains the tetranuclear [B4O5(OH)4]2- anion
2. All four boron atoms lie in one plane
3. It has equal numbers of sp2 and sp3 hybridised boron atoms
4. Each boron atom carries one terminal -OH group

Correct answer: It contains the tetranuclear [B4O5(OH)4]2- anion

Solution

Crystalline borax is built from the discrete tetranuclear [B4O5(OH)4]2- unit; within it two borons are sp2 and two are sp3, so the unit is non-planar.

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