A salt whose aqueous solution will have a pH of more than 7 will … - Vidyadip

MCQ

A salt whose aqueous solution will have a $pH$ of more than $7$ will be:

✓
$\ce{K_2CO_3}$
B
$\ce{K_2SO_4}$
C
$\ce{NaCl}$
D
$\ce{NH_4Cl}$

✓

Answer

Correct option: A.

$\ce{K_2CO_3}$

$\ce{K_2CO_3}$ is formed from a weak acid, carbonic acid $\left( \ce{H_2CO_3} \right)$, and a strong base, potassium hydroxide $\ce{(KOH)}$. On hydrolysis, $\ce{K_2CO_3}$ forms more $OH ^{-}$ions than $H ^{+}$ions. Thus, it is basic, with a $pH$ more than $7$ .

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