Among the following  how many are amphoteric metal oxides 
CO,Aℓ2O3,BeO,As2O3,SnO,PbO,SnO2,PbO2GeO2

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    Solution:

    Be, Al, Sn, Pb are metals and their oxides are amphoteric CO is neutral. As2O3 is amphoteric but As is metalloid GeO2 is acidic.

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