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Question:

Which of the following is an amphoteric hydroxide?

Sr(OH)2

Mg(OH)2

Be(OH)2

Ca(OH)2

Solution:

Correct option is Be(OH)2.
Be(OH)2 is amphoteric in nature since it can react both with acid and base.
Be(OH)2 + 2HCl → BeCl2 + 2H2O
Be(OH)2 + 2NaOH → Na2[Be(OH)4]