Which one of the following pairs of solutions is not an acidic buff...

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Which one of the following pairs of solutions is not an acidic buffer?
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(a) \( \mathrm{CH}_{3} \mathrm{COOH} \) and \( \mathrm{CH}_{3} \mathrm{COONa} \)
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(b) \( \mathrm{H}_{2} \mathrm{CO}_{3} \) and \( \mathrm{Na}_{2} \mathrm{CO}_{3} \)
(c) \( \mathrm{H}_{3} \mathrm{PO}_{4} \) and \( \mathrm{Na}_{3} \mathrm{PO}_{4} \)
(d) \( \mathrm{HClO}_{4} \) and \( \mathrm{NaClO}_{4} \)
(2015)
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