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Q.

Which of the following pairs constitutes buffer ?

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a

HCl and KCl

b

HNO2  and NaNO2

c

NaOH and NaCl

d

HNO3  and NH4NO3

answer is C.

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Detailed Solution

The mixture containing a weak acid HNO2 and its conjugate base NO2- acts as acidic buffer.

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