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JEE Mains · Chemistry · STD 11 -p-Block elements - I
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 \(4\)
Answer & Solution
Correct Answer
(B) \(1\) and \(3\)
Step-by-step Solution
Detailed explanation
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. \(Al_2O_3 . xH_2O + 2NaOH \longrightarrow NaAlO_2 +H_2O\) \(Al_2O_3 . xH_2O+HCl \longrightarrow AlCl_3 + H_2O\)
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