Which of the following statements about \( \mathrm{pH} \) and \( \m...

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Which of the following statements about \( \mathrm{pH} \) and \( \mathrm{H}^{+} \)ion concentration is incorrect?
(a) Addition of one drop of concentrated \( \mathrm{HCl} \) in \( \mathrm{NH}_{4} \mathrm{OH} \) solution decreases \( \mathrm{pH} \) of the solution.
(b) A solution of the mixture of one equivalent of each of \( \mathrm{CH}_{3} \mathrm{COOH} \) and \( \mathrm{NaOH} \) has a \( \mathrm{pH} \) of 7
(c) \( \mathrm{pH} \) of pure neutral water is not zero
- (d) A cold and concentrated \( \mathrm{H}_{2} \mathrm{SO}_{4} \) has lower \( \mathrm{H}^{+} \)ion concentration than a dilute solution of \( \mathrm{H}_{2} \mathrm{SO}_{4} \)
\( \mathrm{P} \)
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