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Among the following oxides, the one which is most basic is:

1. ZnO
2. MgO
3. Al2O3
4. N2O5

Correct answer: MgO

Solution

MgO is the most basic among the given oxides because it is an alkaline earth metal oxide, which is strongly basic in nature. The others are either amphoteric (ZnO, Al2O3) or acidic (N2O5).

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