Which of the following pairs constitutes a buffer? (a) \( \mathrm{H...

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