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Which one of the following is not a buffer solution ?

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Which one of the following is not a buffer solution ?
A. `0.8M H_(2)S+0.8M KHS`
B. `2M C_(6)H_(5)NH_(2)+2M C_(6)H_(5)overset(+)(N)H_(3)Br^(-)`
C. `3M H_(2)CO_(3)+3M KHCO_(3)`
D. `0.05 M KCIO_(4)+0.05M HCIO_(4)`
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Correct Answer - D
Buffer always contains two compounds: a weak acid and weak base. Mixture mentioned in option `(4)` is not a buffer because `HClO_(4)` is a strong acid.
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