Which of the following is the most acidic?

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(C) Metallic oxides are generally basic in nature. As we move from left to right across a period in the periodic table,the acidic character of the oxi

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$Al_2O_3$

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(C) Metallic oxides are generally basic in nature. As we move from left to right across a period in the periodic table,the acidic character of the oxides increases. Among the given options,$Na_2O$,$MgO$,and $CaO$ are basic oxides,while $Al_2O_3$ is amphoteric. However,in the context of comparing these specific oxides,$Al_2O_3$ exhibits the highest acidic character (or least basic character) compared to the others.

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