In the structure of ${[B_{4} O_{5} (OH)_{4}]}^{2 -}$

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Three B atoms are tetrahedral and one B atom is trigonal planar

All four B atoms are trigonal planar.

Two B atoms are tetrahedral and other two are trigonal planar

One B atom is tetrahedral and the other three B atoms are trigonal planar.

answer is D.

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Detailed Solution

It contains two triangular and two tetrahedral units.
The ion is $B_{4} O_{5} {(OH)}_{4}^{- 2}$ and the other water molecules are associated with the metal ions.

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