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Which of the following is wrong?

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At any temperature, pH of water is exactly equal to 7

At $25^{o} C$ , the pH of an acid is less than 7

At $25^{o} C$ , the pH of a base is greater than 7

At $25^{o} C$ , the pOH of water is equal to 7

answer is A.

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Detailed Solution

pH = $- l o g \sqrt{K_{w}}$

At $25^{o} K_{w}$ = $10^{- 14}$

$K_{w} \propto T e m p e r a t u r e$ i.e $K_{w}$ changes with temperature & therefore pH changes.

At $25^{o} C$ , for acids pH < 7 & for bases pH > 7.

At $25^{o} C$ $p K_{w}$ = 14, then pH + pOH = $P K_{w}$

pH = 14 -7 = 7 i.e pH of water at $25^{o} C$ .

Hence, the correct option is option 1) At any temperature, pH of water is exactly equal to 7.

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