MCQ
The pair of amphoteric hydroxides is :
- A$\ce{Al(OH)_3, LiOH}$
- B$\ce{Be(OH)_2, Mg(OH)_2}$
- C$\ce{B(OH)_3 , Be(OH)_2}$
- ✓$\ce{Be(OH)_2 , Zn(OH)_2}$
✓
Answer
Correct option: D.
$\ce{Be(OH)_2 , Zn(OH)_2}$
The pair of amphoteric hydroxides is $\ce{Be(OH)_2, Zn(OH)_2}$ .
Amphoteric oxides reacts with acids as well as bases.
Beryllium hydroxide is amphoteric in nature due to small size, high electronegativity and high ionisation energy of beryllium.
$\ce{Be(OH)_2 + 2HCl \rightarrow BeCl_2 + 2H_2 O}$
$\ce{Be(OH)_2 + 2NaOH \rightarrow Na_2 BeO_2 > + 2H_2 O}$
The amphoteric behaviour of zinc hydroxide is as shown.
$\ce{Zn(OH)_2 + 2HCl \rightarrow ZnCl_2 + 2H_2 O}$
$\ce{Zn(OH)_2 + 2NaOH \rightarrow Na_2 ZnO_2 + H_2O}$
Amphoteric oxides reacts with acids as well as bases.
Beryllium hydroxide is amphoteric in nature due to small size, high electronegativity and high ionisation energy of beryllium.
$\ce{Be(OH)_2 + 2HCl \rightarrow BeCl_2 + 2H_2 O}$
$\ce{Be(OH)_2 + 2NaOH \rightarrow Na_2 BeO_2 > + 2H_2 O}$
The amphoteric behaviour of zinc hydroxide is as shown.
$\ce{Zn(OH)_2 + 2HCl \rightarrow ZnCl_2 + 2H_2 O}$
$\ce{Zn(OH)_2 + 2NaOH \rightarrow Na_2 ZnO_2 + H_2O}$
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