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

Explanation

`Na_(2)O` reacts with water to from sodium hydroxide which turns red litums blue,
`{:(Na_(2)O + H_(2)O ,,to ,,2NaOH ),("Sod oxide ",,,,"Sod . Hydroxide "):}`
Therefore `Na_(2)O` is a basic oxide
In contrast `C1_(2)O_(7)` reacts with water to form perchloric acid which turms blue litmus red
`{:(Cl_(2) O_(7)+H_(2)O ,,to ,,2HClO_(4)),("Chlorine (VII) oxide ",,,,"Perchloric acid "):}`
Therefore `Cl_(2) O_(7)` is an acidic oxide.