Identify the pair of basic oxides from the following.

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Oxides of metals are generally basic in nature, while oxides of non-metals are generally acidic or neutral.

$CaO$ and $Na_{2} O$ are oxides of an alkaline earth metal (Ca) and an alkali metal (Na) respectively. Both react with water to form strong bases ( $Ca(OH)_{2}$ and $NaOH$ ). Hence, they are basic oxides.

$SO_{2}$ and $Cl_{2} O$ are non-metallic oxides and are acidic in nature.

$BaO$ is a basic oxide, but $N_{2} O_{5}$ is an acidic oxide.

$CO$ and $N_{2} O$ are neutral oxides.

Answer: $CaO$ and $Na_{2} O$

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