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Which of the following oxides are amphot...

Which of the following oxides are amphoteric?
`MgO,CaO,FeO,Cu_(2)O,Ag_(2)O,Al_(2)O_(3),PbO,SnO,ZnO.BeO,Na_(2)O,Cs_(2)O`
[If your answer is 2 then write the answer as 0002.]

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The correct Answer is:
`0005`
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