The pH of 0.1M solution of the following salts increases in the order
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a
NaCl < NH4Cl < NaCN < HCl
b
HCl < NH4Cl < NaCl < NaCN
c
NaCN < NH4Cl < NaCl < HCl
d
HCl < NaCl < NaCN < NH4Cl
answer is B.
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Detailed Solution
HCl is a strong acid and its PH < 3 NH4Cl is a salt of weak base and strong acid. Such a salt has a PH = 12PKw-PKb-logCor PH < 7NaCl is a neutral salt and such a salt solution has PH = 7NaCN is a salt of strong base and weak acid. Such a salt solution has a PH given byPH=12PKw-PKb-logC or PH > 7