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Which pairs of reactants most effectively demonstrate the dual acidic and basic behavior of Al2O3.xH2O?

1. Pair 1: Al2O3.xH2O(s) with OH⁻(aq) Pair 2: Al2O3.xH2O(s) with H2O(l)
2. Pair 3: Al2O3.xH2O(s) with H⁺(aq) Pair 4: Al2O3.xH2O(s) with NH3(aq)
3. Pairs 1 and 2
4. Pairs 3 and 4

Correct answer: Pairs 3 and 4

Solution

Pairs 3 and 4 are correct because they demonstrate the amphoteric behavior of Al2O3.xH2O, reacting with both acids and bases to show its dual acidic and basic nature.

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