Q43 / 180 · AIIMS 2012 · Chemistry

Which has the highest $\mathrm{pH}$ ?

  • A
    $\mathrm{CH}_3 \mathrm{COOK}$
  • Correct answer
    B
    $\mathrm{Na}_2 \mathrm{CO}_3$
  • C
    $\mathrm{NH}_4 \mathrm{Cl}$
  • D
    $\mathrm{NaNO}_3$

Solution

$\mathrm{NH}_4 \mathrm{Cl}$ solution is acidic, its $\mathrm{pH} < 7 . \mathrm{NaNO}_3$ solution is neutral, its $\mathrm{pH}=7 . \mathrm{CH}_3 \mathrm{COOK}$ and $\mathrm{Na}_2 \mathrm{CO}_3$ solutions are basic their $\mathrm{pH}>7$. But $\mathrm{Na}_2 \mathrm{CO}_3$ solution is more basic, its $\mathrm{pH}>\mathrm{pH}$ of $\mathrm{CH}_3 \mathrm{COOK}$ solution.

Hence, the correct answer is option: 'B'.

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