Which one of the following is a correct statement

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The hydroxide of boron is acidic, while that of Al is amphoteric

The hydroxide of Al is more acidic than boron

The hydroxide of boron is basic, while that of Al is amphoteric

The hydroxides of both boron and Al are amphoteric

answer is C.

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Detailed Solution

All the elements of this group 13 form oxides and hydroxide.

Boron is the only element in group IIIA of the periodic table which is non-metallic. Metal hydroxides must form a stable cation and anion i.e OH⁻.
. Boron does not form a stable cation. This is the reason why metals form basic hydroxides while boron forms a weak acid called boric acid.

Boron forms acidic oxides and hydroxides, while Al and Ga form amphoteric oxides and hydroxides. In and Tl forms basic oxides and hydroxides. The acidic nature of hydroxides decreases down the group.

Hence the correct option is (C).

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