$40 \, mg$ of pure sodium hydroxide is dissolved in $10 \, L$ of distilled water. The $pH$ of the solution is

$75 \ mL$ of $0.2 \ M \ HCl$ is mixed with $25 \ mL$ of $1 \ M \ HCl$. To this solution, $300 \ mL$ of distilled water is added. What is the $pH$ of the resultant solution?

What is the concentration of hydrogen $[H^{+}]$ ions in $0.01 \, M \, HCl$?

Which of the following has the highest $pH$?

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:

When $10 \ mL$ of $0.1 \ M \ HCl$ and $40 \ mL$ of $0.2 \ M \ H_2SO_4$ solutions are mixed,the $pH$ of the resulting mixture will be: