Question

Which of the following oxide is amphoteric ?

• A. $SnO_2$
• B. $CaO$
• C. $SiO_2$
• D. $CO_2$

Answer 1

Answer: (A)

$SnO_2$

Answer 2

$SnO_2$ reacts with acids as well as bases to form corresponding salts. So it is an amphoteric oxide
$SnO_2 + 4HCl -> SnCl_4 + 2H_2O$
$SnO_2 + 2NaOH -> \underset{\text{sod.stannate }}{Na_2SnO_3 } + H_2O$