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a
Be(OH)2
b
Mg(OH)2
c
Al(OH)3
d
B(OH)3
answer is D.
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Detailed Solution
Mg(OH)2 is a weak base; Be(OH)2 and Al(OH)3 are amphotericin nature B(OH)3can accept one hydroxyl ion from waterH2Oand proton is released. Thus, it acts as a Lewis acid.B(OH)3+2H2O⇌B(OH)4⊖+H3O⊕