Question

Which of the following substances is amphoteric?

• A. $H_3{O}^{+}$
• B. $H_{2}S{O}_4$
• C. $HS{O}_4^{-}$
• D. $S{O}_4^{2-}$

Answer 1

The correct option is C $HS{O}_4^{-}$

Some species are capable of accepting or donating hydrogen ions.

We call them amphoteric.

$H_{2}O+HS{O}_4^{-}\rightleftharpoons H_{2}S{O}_4+O{H}^{-}$

$HS{O}_4^{-}+H_{2}O\rightleftharpoons H_3{O}^{+}+S{O}_4^{2-}$

So, option C is correct.