Among the following how many are amphoteric metal oxides
$CO, {Aℓ}_{2} O_{3}, BeO, {As}_{2} O_{3}, SnO, PbO, {SnO}_{2}, {PbO}_{2} {GeO}_{2}$

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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