Select the correct statements  
(a) ${\mathrm{p}}^{\mathrm{H}}$ Of pure water at any temperature, it is equal to 7
(b) ${\mathrm{p}}^{\mathrm{H}}$Of 10^–3 M $C{H}_{3}COOH$Is less than 3
(c) ${\mathrm{p}}^{\mathrm{H}}$ Of 10^–3 M $N{H}_{4}OH$Is less than 11
(d) At any temperature $p^H + p^{OH} = 14$

 ${\mathrm{p}}^{\mathrm{H}}$ Of pure water at any temperature is equal to 7-----Incorrect statement

${\mathrm{p}}^{\mathrm{H}}$ Of pure water (any solution) depends on temperature.

 ${\mathrm{p}}^{\mathrm{H}}$Of 10^–3 M $C{H}_{3}COOH$Is less than 3 ------- incorrect statement

${\mathrm{p}}^{\mathrm{H}}$ Of weak acid and weak base depend on degree of ionization, temperature, concentration , and temperature.  When the degree of ionization of weak acid is 1, then the  ${\mathrm{p}}^{\mathrm{H}}$  Of the solution is 3. As %$\mathrm{\alpha }$ Of weak acid is less than 1; $\left[{\mathrm{H}}^{+}\right]$ Decreases and ${\mathrm{p}}^{\mathrm{H}}$ Of solution increases.(>3)