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Borax is actually made of two tetrahedra...

Borax is actually made of two tetrahedra and two triangular units joined together and should be written as
`Na_(2)[B_(4)O_(5)(OH)_(4)].8H_(2)O`.
Consider the following statements about borax :
A : Each boron atom has four `B-O` bonds.
B : Each boron atom has three `B-O` bonds.
C : Two boron atoms have four `B-O` bonds while other two have three `B-O` bonds.
D : Each boron atom has one-OH group.
Select correct statement (s) :

A

I,II

B

II,III

C

III,IV

D

I,III

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