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NEET levelSingle correct optionDifficulty 1 of 3ie121

Which of the following is NOT a buffer solution?

A $HCOOH$ + $HCOONa$ in water
B $NH X_{4} OH$ + $NH X_{4} Cl$ in water
C $CH X_{3} COOH$ + $CH X_{3} COOK$ in water
D $HCl$ + $NaCl$ in water

Answer: D

HCl is a strong acid and NaCl does not supply a conjugate base of a weak acid, so no weak conjugate pair is present and the pH is not buffered.

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