Question
Amphoteric hydroxides react with both alkalies and acids. Which of the following group 2 metal hydroxides is soluble in sodium hydroxide?
A.
$$Be{\left( {OH} \right)_2}$$
B.
$$Mg{\left( {OH} \right)_2}$$
C.
$$Ca{\left( {OH} \right)_2}$$
D.
$$Ba{\left( {OH} \right)_2}$$
Answer :
$$Be{\left( {OH} \right)_2}$$
Solution :
Beryllium hydroxide, $$Be{\left( {OH} \right)_2}$$ is amphoteric in nature, as it reacts with acid and alkali both.
$$Be{\left( {OH} \right)_2} + 2HCl \to $$ $$BeC{l_2} + 2{H_2}O$$
$$Be{\left( {OH} \right)_2} + 2NaOH \to $$ $$N{a_2}Be{O_2} + 2{H_2}O$$