Which one of the following is most basic?

A l_{2} O_{3}

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M g O

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S i O_{2}

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P_{2} O_{5}

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Solution

The correct option is B $M g O$
Acidity increases from left to right, ranging from strongly basic oxides on the left to strongly acidic ones on the right with an amphoteric oxide (aluminum oxide) in the middle. An amphoteric oxide is one which shows both acidic and basic properties. So, $M g O$ is the most basic oxide. The basicity decreases in the order : $M g O > A l_{2} O_{3} > S i O_{2} > P_{2} O_{5}$
Hence, option B is correct.

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