36. How many of the following oxides of Group 13, 14, and 15 elements are amphoteric?

 As₂O₃, Ga₂O₃, PbO, Sb₂O₃, SnO₂, Tl₂O
(A) 1
(B) 2
(C) 3
(D) 5
(E) 6

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