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THe crystalline form of borax has

A) tetranuclear

$[B_{4}O_{5}(OH)_{4}]^{2-}$ unit

B) all boron atoms in the same plane

C) equal number of

$sp^{2}$ and

$sp^{3}$ hybridised boron atoms.

D) one terminal hydroxide group atom

Option A,C.D

$Na_{2}B_{4}O_{7}.10H_{2}O$ (borax) is actually made of two tetrahedral and two triangular units and is actually written as

$Na_{2}[B_{4}O_{5}(OH)_{4}].5H_{2}O$

(a) Thus, correct

(b) Boron atoms are in different planes thus, incorrect

(d) Each boron has one- OH group thus, correct

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