Which statement/relationship is correct?

The value of ${\mathrm{pK}}_{\mathrm{\omega }}$ at $25° \mathrm{C}$ is 7.

pH of $0.1 \mathrm{M} {\mathrm{HNO}}_3,0.1 \mathrm{M} \mathrm{HCl},0.1 \mathrm{M} \mathrm{HI}$ are not equal

$\mathrm{pH}=-\log \frac{1}{\left[{\mathrm{H}}^{+}\right]}$

At $25° \mathrm{C}$the pH of pure water is 7.