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  4. Which of the following oxides is amphoteric in character?

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Q. Which of the following oxides is amphoteric in character?

UPSEEUPSEE 2008

Solution:

A species is amphoteric if it is soluble in acid (behaves as a base) as well as in base (behaves as an acid)
$SnO_{2}$ is an amphoteric oxide
$SnO_{2} + 4HCl \to SnCl_{4}+2H_{2}O$
$SnO_{2} +2NaOH \to Na_{2}SnO_{3}+H_{2}O$