Among the following, the most basic oxide is $:$

A l_{2} O_{3}

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P_{2} O_{5}

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S i O_{2}

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N a_{2} O

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Solution

The correct option is C $N a_{2} O$
$N a_{2} O$ is the most basic oxide.
$A l_{2} O_{3}$ is amphoteric.
$P_{2} O_{5}$ is acidic oxide.
$S i O_{2}$ is weakly acidic oxide.
Hence, the option (D) is correct answer.

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