In the structure of B4O5(OH)42−

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All four B atoms are trigonal planar.

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

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

Two B atoms are tetrahedral and other two are trigonal planar

answer is D.

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Detailed Solution

It contains two triangular and two tetrahedral units.The ion is B4O5(OH)4-2 and the other water molecules are associated with the metal ions.

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