Acid base question

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lyjw88

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Why is metal oxide (ie CaO) acidic and non-metal oxide (ie CO2) basic?
 
I am not really sure if this is the correct answer but i would say due to polarity. CO2 has polar bonds, but is overall non-polar. CaO, is ionic (metal and non-metal) and thus if you put it in water, it would ionize completely. Making it acidic. I really dont know if this is correct though
 
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