First slide

Salt hydrolysis :

Question

The pH of 0.1 M solution of the following salts increases in the order

Moderate

A

$NaCl < {NH}_{4} Cl < NaCN < HCl$
B

$HCl < {NH}_{4} Cl < NaCl < NaCN$
C

$NaCN < {NH}_{4} Cl < NaCl < HCl$
D

$HCl < NaCl < NaCN < {NH}_{4} Cl$

Solution

NH₄Cl Undergoes cationic hydrolysis, hence pH is $<$ 7(4.6)
NaCN undergoes anionic hydrolysis hence pH is > 7.(11)
HCl is strong acid and NaCl is neutral solution.
Hence the pH of given solutions will increases.
$HCl$ < ${NH}_{4} Cl < NaCl < NaCN$

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