Lithium oxide (Li2O) is not amphoteric in nature. It is a basic oxide, meaning it reacts with water to form a strong base (lithium hydroxide) but does not show acidic properties.
Beryllium oxide (BeO) is amphoteric in nature. It can react with both acids and bases. For example, it can react with strong acids to form beryllium salts, and it can react with strong bases to form beryllate salts.
Calcium oxide (CaO) is not amphoteric in nature. It is a strong base and reacts with water to form calcium hydroxide, displaying basic properties.
Potassium oxide (K2O) is not amphoteric. It is a basic oxide and reacts with water to form a strong base (potassium hydroxide).
The amphoteric nature is exhibited by B. Beryllium oxide (BeO).