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Classify the following oxides as neutral...

Classify the following oxides as neutral, acidic, basic or amphoteric.
`CO, B_2_3 , SiO_2, CO_2, Al_2O_3, PbO_2, Tl_2O_3`

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More the positive oxidation state of the central atom, more the acidic nature. So, `CaO lt PbO_(1) lt SO_(3) lt Cl_(2)O_(7)`
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