Which of the following oxides is amphoteric in character?

Options

(a) Co₂
(b) CaO
(c) SiO₂
(d) SnO₂

Correct Answer:

SnO₂

Explanation:

CaO — basic
Co₂ — acidic
SiO₂ — weakly acidic
SnO₂ — amphoteric