The correct answer is (b) Al.
· Aluminium (Al) forms an amphoteric oxide, specifically aluminium oxide (Al₂O₃).
· Amphoteric oxides can react with both acids and bases, showing both acidic and basic properties.
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· Na (Sodium): Forms a basic oxide, sodium oxide (Na₂O).
· Cu (Copper): Forms a basic oxide, copper(II) oxide (CuO).
· Ca (Calcium): Forms a basic oxide, calcium oxide (CaO).
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