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Which of the following expressions is/are true?
(a) \( \left[\mathrm{H}^{+}\right]=\left[\mathrm{OH}^{-}\right]=\sqrt{K_{w}} \) for a neutral solution
\( \mathrm{P} \)
(b) \( \left[\mathrm{OH}^{-}\right]\sqrt{K_{w}} \) for an acidic solution
W
(c) \( \mathrm{pH}+\mathrm{pOH}=14 \) at all temperature
(d) \( \left[\mathrm{OH}^{-}\right]=10^{-7} \mathrm{M} \) for a neutral solution at \( 25^{\circ} \mathrm{C} \)
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