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Chemistry Question on p -Block Elements

In the following sets of reactants which two sets best exhibit the amphoteric characters of Al2O3.xH2O {Al_2O_3. xH_2O} ? Set 1: Al2O3.xH2O(s) {Al2O3.xH2O (s)} and OH−(aq) {OH- (aq)} Set 2: Al2O3.xH2O(s) {Al2O3.xH2O (s)} and H2O(l) {H2O (l)} Set 3: Al2O3.xH2O(s) {Al2O3.xH2O (s)} and H+(aq) {H+ (aq)} Set 4: Al2O3.xH2O(s) {Al2O3.xH2O (s)} and NH3(aq) {NH3 (aq)}

A

1 and 2

B

1 and 3

C

2 and 4

D

3 and 4

Answer

1 and 3

Explanation

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. Al2O3.xH2O+2NaOH−>NaAlO2+H2O {Al2O3. xH2O + 2NaOH -> NaAlO2 + H2O} Al2O3.xH2O+HCl−>AlCl3+H2O {Al2O3. xH2O + HCl -> AlCl3 + H2O }