Which one of the following is not a buffer solution?

Options

A. `0.8 " M " H_(2)S +0.8 ` M KHS
B. `2 " M " C_(6)H_(5)NH_(2) +2 M C_(6)H_(5)overset (+)N H_(3) Br`
C. `3 " M " H_(2)CO_(3) +3 " M " KHCO_(3)`
D. `0.05 " M " KClO_(4) +0.05 " M "HClO_(4)`

Answer

D

Explanation

Because `HClO_(4)` is a strong acid. While buffer is a mixture of weak acid and their salt.