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Question

Which of the following are amphoteric oxides?

A
SnO2
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B
Al2O3
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C
Ga2O3
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D
SiO2
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Solution

The correct options are
A Al2O3
B SnO2
D Ga2O3
Generally in 14 group CO2 and GeO2 and SiO2 are acidic, PbO2 and SnO2 are amphoteric.
Generally in 13 group only B2O3 is acidic . Al2O3 and Ga2O3 are amphoteric and those of indium and thallium are basic in nature.
So, SnO2,Al2O3,Ga2O3 are amphoteric.

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