The number of acidic oxides oxides among the following are `CO_(2),Rb_(2)O,Mn_(2)O_(7),CrO_(3),Na_(2)O,MgO,Al_(2)O_(3),SO_(2)`
The number of acidic oxides oxides among the following are
`CO_(2),Rb_(2)O,Mn_(2)O_(7),CrO_(3),Na_(2)O,MgO,Al_(2)O_(3),SO_(2)`
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