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Show by a chemical reaction with water t...

Show by a chemical reaction with water that 'Na_2 O' is a basic oxide and 'Cl_2 O_7' is an acidic oxide.

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Na_2 O+H_2 O longrightarrow 2 NaOH. (strong base) .Cl_2 O_7+H_2 O longrightarrow 2 HClO_4. (strong acid) Their basic or acidic nature can be qualitatively tested with litmus paper.
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