p-Block elementsHard

Question

When borax is dissolved in water :

Options

A.B(OH)3 is formed only
B.[B(OH)4]- is formed only
C.both B(OH)3 and [B(OH)4]- are formed
D.[B3O3(OH)4]- is formed only

Solution

[B4O5(OH)4]2- + 5H2O  ⇋  2B(OH)3 + 2[B(OH)4]-
or
[B4O7]2- + 7H2O  →  2B(OH)3 + 2[B(OH)4]-

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