JEE Main Chemistry question

Chemistry Equilibrium JEE Main

Which of the following pairs constitutes buffer?

(A)HNO₃ and NH₄NO₃
(B)HCl and KCl
(C)HNO₂ and NaNO₂Correct
(D)NaOH and NaCl

Answer: (C)

Solution

A weak acid with its conjugate base salt.

Question ID VK-136415