The pair of amphoteric hydroxides is :

Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 12, 2026

Be(OH) 2 , Al(OH) 3

Al(OH) 3 , LiOH

B(OH) 3 , Be(OH) 2

Be(OH) 2 , Mg(OH) 2

Text Solution

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The correct answer is:

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 + 2H 2 O [Be(OH 2 ) 4 ]Cl 2 .

Al(OH) 3 + OH – [Al(OH) 4 ] – (aluminate ion).

Al(OH) 3 + H 2 O + 3HCl [Al(OH 2 ) 4 ]Cl 3 .

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