Calculate the $pOH$ of a $0.001 \text{ M } HCl$ solution.

The concentration of $H^{+}$ ions in $0.1 \, M \, NaOH$ is .......

Given below are two statements:
Statement-$I$: $pH$ of a $1.0 \times 10^{-8} \ M$ solution of $HCl$ is $8$ at $25^{\circ} C$.
Statement-$II$: $HCl$ is a strong acid and negative log of $H^{+}$ concentration is called $pH$.
In the light of the above statements,choose the most appropriate answer from the options given below:

The $pH$ of an aqueous solution containing $[H^{+}] = 3 \times 10^{-3} \ M$ is

What will be the $pH$ value of $0.05 \, M$ $Ba(OH)_2$ solution?

Aqueous solution of $HCl$ has the $pH = 4$. Its molarity would be (in $, M$)