At $90\, ^\circ C$ pure water has $[H_3O^{+}] = 10^{-6}\, mol\, L^{-1}$. The value of $K_w$ at $90\, ^\circ C$ is
- A$10^{-6}$
- B$10^{-12}$
- C$10^{-14}$
- D$10^{-8}$
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