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Question:

Which one of the following pairs of solutions is not an acidic buffer?

H2CO3 and Na2CO3

H3PO4 and Na3PO4

HClO4 and NaClO4

CH3COOH and CH3COONa

Solution:

An acidic buffer includes a weak acid and its salt with a strong base. HClO4 and NaClO4 contains a strong acid (HClO4) and its salt with a strong base (NaOH). HClO4 and NaClO4 is not an acidic buffer. Hence, option C is correct.