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Question

Which one of the following is not a buffer solution?

A
CH3COOH/CH3COONa
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B
HCl/NaCl
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C
HCOOH/HCOONa
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D
NH4OH/NH4Cl
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Solution

The correct option is B HCl/NaCl
A solution of weak acid and weak base with its conjugate salt in water is called as Buffer solution.
CH3COOH and HCOOH are weak acids. Again NH4OH is a weak base.
All the option are buffer solution is an aqueous solution consisting of a mixture of weak acid and its conjugate base or vice-versa except option (b) which have HCl a strong acid and a salt of strong acid(HCl) and base (NaOH) i.e. NaCl

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