Question

Which of the following oxide is amphoteric ?

• A. $\ce{SnO_2}$
• B. $\ce{CaO}$
• C. $\ce{SiO_2}$
• D. $\ce{CO_2}$

Answer 1

Answer: (A)

$\ce{SnO_2}$

Answer 2

${SnO_2}$ is an amphoteric oxide because it reacts with acids as well as bases to form corresponding salts. ${SnO_2 + 2H_2SO_4 (conc) -> Sn(SO_4)_2 + 2H_2O}$ ${SnO_2 + 2NaOH -> Na_2SnO_3 + H_2O}$