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Among the following oxides, how many of ...

Among the following oxides, how many of them are amphoteric oxides ?
(a) `B_(2)O_(3)` , (b) `Al_(2)O_(3)` , (c ) `CaO` , (d) `ZnO`
(e) `Ga_(2)O_(3)` , (f) `SnO_(2)` , (g) `PbO_(2)` , (h) `BeO`
(i) `CuO` , (j) `Fe_(2)O_(3)`

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