Which one of the following is correct statement ? - Infinity Learn by Sri Chaitanya

A
The hydroxide of aluminium is more acidic than that of boron.
B
The hydroxide of boron is basic, while that of aluminium is amphoteric.
C
The hydroxide of boron is acidic, while that of aluminium is amphoteric.
D
The hydroxide of boron and aluminium are amphoteric

Solution:

Boron is the only non-metal in group-13 and its hydroxide is acidic. Boron hydroxide is formed when borax is treated with acid in the presence of water. On heating, boric hydroxide forms meta-boric acid.

$B {(OH)}_{3} \overset{∆}{\to} \underset{Metaboric acid}{{HBO}_{2}} + H_{2} O$

Aluminum hydroxide is amphoteric because it reacts with both acid and base.

$\begin{matrix} Al {(OH)}_{3} + 3 HCl & \to & {AlCl}_{3} + 3 H_{2} O \\ Al {(OH)}_{3} + NaOH & \to & {NaAlO}_{2} + 2 H_{2} O \end{matrix}$

Solution:

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