Question

A salt is dissolved in water and the $pH$ of this solution is measured with a universal indicator paper. If the $pH$ of solution is less than $7$, the salt is most likely to be:

• A. $C{H}_{3}COONa$
• B. $KCl$
• C. $N{a}_{2}C{O}_3$
• D. $N{H}_{4}Cl$

Answer 1

The correct option is D $N{H}_{4}Cl$

$N{H}_{4}Cl$ is the salt of a weak base and strong acid $HCl$, on hydrolysis $N{H}_{4}Cl$ forms more $H^{+}$ ions than $O{H}^{-}$ ions. Thus, it is acidic and $pH$ is less than $7$.