Q.

At 25⁰ C, for an acid

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a

   [   H+   ]     10-7M

b

pH  7

c

    [   OH-   ]     10-7M

d

All of the above

answer is D.

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Detailed Solution

Although pH lowers as temperature rises, we may conclude that this does not imply that water becomes more acidic when the temperature is high. When there are more H+ ions than OH- ions in a solution, it is considered to be acidic.

For example, even if the pH of pure water varies, the concentration of hydrogen and hydroxide ions remains constant, allowing the solution to be neutral.

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