Solve this:
Q. Which of the following oxides is not amphorteric?
A. C$O_2$
B. Ge$O_2$
C. Sn$O_2$
D. Pb$O_2$

CO2 is an acidic oxide and reacts with water to give acids.But GeO2,SnO2 and PbO2 are amphoteric in nature as they behave both like acidic and basic oxides.