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Show by a chemical reaction with water that `Na_(2)O` is a basic oxide and `Cl_2O_(7)` is an acidic oxide.

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`Na_(2)O` with water forms a strong base whereas `Cl_(2)O_(7)` forms strong acid.
`Na_(2)O + H_(2)O rarr 2NaOH`
`Cl_(2)O_(7) + H_(2)O to 2HClO_(4)`
Their basic or acidic nature can be qualitatively tested with litmus paper.
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