MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryIonic equilibriumBuffer Solutions

Which of the following pairs constitutes a buffer?

A.HNO2 and NaNO2✓ Correct

B.NaOH and NaCl

C.HNO3 and NH4NO3

D.HCl and KCl

Explanation

A pair of HNO2 and NaNO2 constitutes a buffer, because HNO2 a weak acid and NaNO2 is a salt of weak acid (HNO2) with strong base (NaOH). Hence, it is an example of acids buffer solution.

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