Which of the following pairs constitutes a buffer? a. \( \mathrm{HNO}_{2} \) and \( \mathrm{NaNO...

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Which of the following pairs constitutes a buffer?
a. \( \mathrm{HNO}_{2} \) and \( \mathrm{NaNO}_{2} \)
b. \( \mathrm{NaOH} \) and \( \mathrm{NaCl} \)
c. \( \mathrm{HNO}_{3} \) and \( \mathrm{NH}_{4} \mathrm{NO}_{3} \)
d. \( \mathrm{HCl} \) and \( \mathrm{KCl} \)
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