Question

The conjugate acid of $N{H}_3$ is:

• A. $N{H}_3$
  
• B. $N{H}_4^{+}$
  
• C. $N{H}_2^{-}$
• D. $N{H}_{2}OH$

Answer 1

The correct option is B $N{H}_4^{+}$


Species formed by the gain of a proton from a base is called conjugate acid of that base.

$N{H}_3+H^{+}\rightleftharpoons N{H}_4^{+}Base+Proton\rightleftharpoons ConjugateAcid$

Theory:
Conjugate acid:
Species formed by the gain of a proton from a base is called conjugate acid of that base. [Conjugate acid has one extra proton than the base]
$N{H}_3\left(g\right)\stackrel{H^{+}}{\to }N{H}_4^{-}\left(aq\right)$
$N{H}_3\left(g\right)$ is base and $N{H}_4^{-}\left(aq\right)$ is conjugate acid
$H_{2}O\left(l\right)\stackrel{H^{+}}{\to }{H}_3{O}^{+}\left(aq\right)$
$H_{2}O\left(l\right)$ is base and $H_3{O}^{+}\left(aq\right)$ is conjugate acid