Question

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

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Re-AIPMT 2015

• A. $H_{3}P{O}_4$ and $N{a}_{3}P{O}_4$
• B. $HCl{O}_4$ and $NaCl{O}_4$
• C. $C{H}_{3}COOH$ and $C{H}_{3}COONa$
• D. $H_{2}C{O}_3$ and $N{a}_{2}C{O}_3$

Answer 1

The correct option is B $HCl{O}_4$ and $NaCl{O}_4$

An acidic buffer includes weak acid and its salt with a strong base.
$HCl{O}_4$ and $NaCl{O}_4$ contains strong acid $HCl{O}_4$ and its salt with strong base NaOH.
$HCl{O}_4$ and $NaCl{O}_4$ is not an acidic buffer.

$HC{O}_3,H_{3}P{O}_4,\text{and}C{H}_{3}COOH$ are weak acids.
Hence, option (c) is correct.