Question

Which choice or choices demonstrate amphoterism?
i. $HCl+H_{2}O\to H_3{O}^{+}+C{l}^{-}$ and $H_{2}O+N_3\to O{H}^{-}+N{H}_4^{-}$
ii. $H{S}^{-}+HCl\to C{l}^{-}+H_{2}S$ and $H{S}^{-}+N{H}_3\to N{H}_4^{+}+S^{2-}$
iii. $HCl+NaOH\to NaCl+H_{2}O$ and $NaCl+H_{2}O\to HCl+NaOH$

• A. i only
• B. ii only
• C. iii only
• D. i and ii only
• E. i and iii only

Answer 1

The correct option is D i and ii only

Amphoteric compound or ion is a molecule that cn act as both acid as well as base.

In the first reaction, $H_{2}O$ acts as both acid and base.It accepts proton and loses proton. Hence. it shows amphoterism.

In the second reaction, ${HS}^{-}$ does the same thing.

It accepts and loses proton.

Hence, both shows amphoterism.