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Which of the following oxides are amphot...

Which of the following oxides are amphoteric .
(1) BeO
(2) SnO
(3) ZnO
(4) `Al_2O_3`

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(1) covalent, (2) covalent, (3) electrovalent, (4) electrovalant, (5) electrovalent, (6) covalent, (7) electrovalent, (8) electrovalent, covalent and co-ordinate covalent, (9) covalent, (10) electrovalent, (11) covalent, (12) electrovalent, covalent and coordinate covalent.
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