p-Block elementsHard

Question

Aqueous solution containing 1 mol of borax reacts with 2 mol of acids. This is because of :

Options

A.formation of 2 mol of B(OH)3 only
B.formation of 2 mol of [B(OH)4]- only
C.formation of 1 mol each of B(OH)3 and [B(OH)4]-
D.formation of 2 mol each of [B(OH)4]- and B(OH)3, of which only [B(OH)4]- reacts with acid

Solution

[B4O5(OH)4]2- + 5H2O ⇋ 2B(OH)3 (weak acid) + 2[B(OH4)]- (salt)

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