NaCl is a salt of strong acid HCl and strong base NaOH. It does not undergo hydrolysis in water. Hence its aqueous solution is neutral.
Sodium acetate is a salt of strong base sodium hydroxide and weak acid acetic acid. Its solution is basic in nature.
Ammonium chloride is the salt of strong acid HCl and weak base ammonium hydroxide. Its solution is acidic in nature.
A mixture of acetic acid and sodium acetate is an acidic buffer. Its aqueous solution is acidic in nature.
Thus, A-4 ; B-3; C-2; D-1
Hence, the correct option is B
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