MCQ
At $363K,$ pure water has$[\mathrm{H}_2 \mathrm{O}^{+}]=10^{-6} \mathrm{M}$. The value of $\mathrm{K}_{\mathrm{w}}$ at this temperature will be :
  • A
    $10^{-6} $
  • $10^{-12} $
  • C
    $ 10^{-13} $
  • D
    $ 10^{-14}$

Answer

Correct option: B.
$10^{-12} $
$[\text{H}_3\text{O}^+]=[\text{OH}^-]=10^{-6}\text{M}$
$\text{K}_{\text{w}}=[\text{H}_3\text{O}^+][\text{OH}^-]$
$=10^{-6}\times10^{-6}=10^{-12}\text{M}.$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free