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Which one of the following mixture does ...

Which one of the following mixture does not act as a buffer solution?

A

`H_(3)PO_(4)+NaH_(2)PO_(4)`

B

`0.2M NH_(4)Cl+0.1M KOH`

C

`2M HCl+2M NH_(4)OH`

D

`CH_(3)COONH_(4)`

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