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The pH of 0.1M soution of the folowing salts increases in the order:

(a) NaCl < NH4Cl < NaCN < HCl

(b) HCl < NH4Cl < NaCl < NaCN

(c) NaCN < NH4Cl < NaCl < HCl

(d) HCl < NaCl < NaCN < NH4Cl