Which of the following expressions is not true?

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For a neutral solution $[H^{+}] = [{OH}^{-}] = 10^{- 7} M$ at all temperatures

For an acidic solution $[H^{+}] > \sqrt{K_{w}}$ and $[{OH}^{-}] < \sqrt{K_{w}}$

For an alkaline solution $[H^{+}] < \sqrt{K_{w}}$ and $[{OH}^{-}] > \sqrt{K_{w}}$

For a neutral solution $[H^{+}] = [{OH}^{-}] = \sqrt{K_{w}}$

answer is D.

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Detailed Solution

The statement (d) is applicable only at 25 °C and is not independent of temperature.

$K_{w} = [H^{+}] [{OH}^{-}]$

As temperature rises, K w's value rises as well.

Consequently, as temperature rises, $[H^{+}]$ and $[{OH}^{-}]$ increase.

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