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

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Q. The pH of $0.1\, M$ solution of the following salts increases in the order

IIT JEEIIT JEE 1999Equilibrium

Solution:

$NaCN$ is basic salt, has highest pH while $HCl$ has lowest pH. $NaCl$ is neutral salt has $pH = 7$ while $NH_4Cl$ is acidic salt, has pH less than $7$.
$pH: HCl < NH_4Cl < NaCl < NaCN$