Question

Which of the following oxides is amphoteric in nature ?

• A. CaO
• B. CO2
• C. SiO2
• D. SnO2

Answer 1

Answer: (D)

SnO2

Answer 2

CaO - basic, CO2 and SiO2 - acidic, SnO2 - amphoteric, as it reacts with both acids and bases.

SnO2 + 4HCI $\rightarrow$ SnCI4 + 2H2O

SnO2 + 2NaOH $\rightarrow$ Na2SnO3 + H2O