Number of statement(s) that is/are correct :
(a) On increasing temperature, pH of pure water decreases
(b) On increasing temperature, pOH of pure water decreases
(c) On increasing dilution, dissociation of weak electrolyte increases
(d) pH of $10^{- 7} M NaOH (aq)$ is 7 at 25° C.
(e) At equivalence point (during titration of acid and base) solution must be neutral.
(f) Generally, pH of buffer solution does not change on dilution.
(g) pH of salt of weak acid and weak base depends on concentration of salt.

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answer is 4.

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Detailed Solution

It is evident that when the temperature rises, the pH of pure water lowers.
With an increase in temperature, both pH and pOH drop. Note that pure water always has the same pH and pOH values.
As a result, dilution causes a greater degree of weak electrolyte dissociation.
The ratio of salt to acid (or base) concentration does not alter with dilution.

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