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Aqueous solutions of \( \mathrm{HNO}_{3}, \mathrm{KOH}, \mathrm{CH}_{3} \mathrm{COOH} \), \( \mathrm{CH}_{3} \mathrm{COONa} \) of identical concentrations are provided. The pairs of solutions which forms a buffer upon mixing is (are):
(A) \( \mathrm{HNO}_{3} \) and \( \mathrm{CH}_{3} \mathrm{COOH} \)
(B) \( \mathrm{KOH}+\mathrm{CH}_{3} \mathrm{COONa} \)
(C) \( \mathrm{HNO}_{3} \) and \( \mathrm{CH}_{3} \mathrm{COONa} \)
(D) \( \mathrm{CH}_{3} \mathrm{COOH}+\mathrm{CH}_{3} \mathrm{COONa} \)
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