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Question
Amphoteric hydroxides react with both alkalies and acids. Which of the following Group 2 metal hydroxides is soluble in sodium hydroxide?
Options
Be(OH)2
Mg(OH)2
Ca(OH)2
Ba(OH)2
Solution
Be(OH)2
Explanation:
Be(OH)2 is amphoteric. It reacts with both acids and bases. It reacts with acid to form beryllium chloride and it reacts with base to form beryllate ion which is soluble in sodium hydroxide. The reaction is shown below.
\[\ce{Be(OH)2 + 2OH- -> [Be(OH)4]^{2-}}\]
\[\ce{Be(OH)2 + 2HCl -> BeCl2 + 2H2O}\]
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