Question

4. Aluminium hydroxide, Al(OH), is insoluble in water, but
dissolves readily in both acidic and basic solutions. Such
behaviour is characteristic of

(a) polyprotic behaviour (b) hydrophilic behaviour
(c) a buffer
(d) amphoteric behaviour​

Answer 1

ANSWER

Aluminium hydroxide is amphoteric. Because it reacts with both acids and bases. Like any conventional base, the OH radical in Al(OH)_3Al(OH)

3

neutralizes H+ to make water and an aluminium salt. Al{(OH)}_3Al(OH)

3

solid will also react with excess OH– to dissolve and form the complex ion [Al(OH)_4^-][Al(OH)

4

−

]. Hence, B is the correct answer.

Answer 2

Answer:

d amphoteric behaviour