Question

$H_{2}S$ is $a$:

• A. weak dibasic acid
• B. weak monobasic acid
• C. strong dibasic acid
• D. strong monobasic

Answer 1

The correct option is A weak dibasic acid

$H_{2}S\stackrel{K{a}_1}{\rightleftharpoons }H{S}^{-}+H^{+}{K}_{a1}<<1$
$H{S}^{-}\stackrel{K{a}_2}{\rightleftharpoons }{S}^{2-}+H^{+}{K}_{a2}<<K_{a1}$
$\therefore H_{2}S$ is a weak dibasic acid