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p-Block Elements - I
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In the following sets of reactants which two sets best exhibit the amphoteric characters of $Al_2O_3. xH_2O$ ?
Set $1$: $Al_2O_3 .xH_2O\, (s)$ and $OH^-(aq)$
Set $2$: $Al_2O_3 .xH_2O\, (s)$ and $H_2O\,(l)$
Set $3$: $Al_2O_3 .xH_2O\, (s)$ and $H^+(aq)$
Set $4$: $Al_2O_3 .xH_2O\, (s)$ and $NH_3(aq)$
A
$1$ and $2$
B
$1$ and $3$
C
$2$ and $4$
D
$3$ and $4$
(JEE MAIN-2014)
Solution
Aluminium oxide is amphoteric oxide because it shows the properties of the both acidic and basic oxides . It reacts with both acids and bases to form salt and water.
$Al_2O_3 . xH_2O + 2NaOH \longrightarrow NaAlO_2 +H_2O$
$Al_2O_3 . xH_2O+HCl \longrightarrow AlCl_3 + H_2O$
Standard 11
Chemistry
