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Equilibrium — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryEquilibrium1 Mark
MCQ
Which of the following is not a buffer solution?
  • A
    $ \mathrm{CH}_3 \mathrm{COOH}+\mathrm{CH}_3 \mathrm{COONa} $
  • B
    $ \mathrm{H}_3 \mathrm{BO}_3+\mathrm{Na}_3 \mathrm{BO}_3 $
  • ✓
    $\mathrm{HClO}_4+\mathrm{NaClO}_4 $
  • D
    $ \mathrm{NH}_4 \mathrm{OH}+\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4 $
✓

Answer

Correct option: C.
$\mathrm{HClO}_4+\mathrm{NaClO}_4 $
A buffer solution is a mixture of a weak acid or a weak base and its salt.
In the given question, $\mathrm{CH}_3 \mathrm{COOH}$ and $\mathrm{H}_3 \mathrm{BO}_3$ are weak acids whereas $\mathrm{NH}_4 \mathrm{OH}$ is a weak base. $\mathrm{HClO}_4$​ is a strong acid, its mixture with its salt cannot be a buffer solution according to the definition of buffer solution.

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