Which one of the following is more acidic?

N a_{2} O

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M g O

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A l_{2} O_{3}

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C a O

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Solution

The correct option is B $A l_{2} O_{3}$
Among the following $A l_{2} O_{3}$ is more acidic as $A l$ exhibits least metallic in nature. As the non metallic nature of oxides decreases acidic nature increases(order of metallic nature $N a > C a > M g > A l$ )
Hence option C is correct.

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