s-Block ElementsHard
Question
The pair of amphoteric hydroxides is :
Options
A.Be(OH)2, Al(OH)3
B.Al(OH)3, LiOH
C.B(OH)3, Be(OH)2
D.Be(OH)2, Mg(OH)2
Solution
Beryllium hydroxide and aluminium hydroxide are amphoteric in nature on account of diagonal relationship.
Be(OH)2 + 2OH- → [Be(OH)4]2- (beryllate ion). ; Be(OH)2 + 2HCl + 2H2O → [Be(OH2)4]Cl2.
Al(OH)3 + OH- → [Al(OH)4]- (aluminate ion).
Al(OH)3 + H2O + 3HCl → [Al(OH2)4]Cl3.
Be(OH)2 + 2OH- → [Be(OH)4]2- (beryllate ion). ; Be(OH)2 + 2HCl + 2H2O → [Be(OH2)4]Cl2.
Al(OH)3 + OH- → [Al(OH)4]- (aluminate ion).
Al(OH)3 + H2O + 3HCl → [Al(OH2)4]Cl3.
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