1.

A group of acidic oxide is

Answer»

`CrO_(3),Mn_(2)O_(7)`
`ZNO,Al_(2)O_(3)`
`CaO,ZnO`
`Na_(2)O, Al_(2)O_(3)`

Solution :`CrO_(3) and Mn_(2)O_(7)` are acidic oxide since they react with water to form acid.
`CrO_(3)+H_(2)Orarrunderset("acid")underset("Chromic")(H_(2)CrO_(4)),Mn_(2)O_(7)+H_(2)Orarrunderset("acid")underset("Permagnic")(2HMnO_(4))`


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