When $50 \, mL$ of $0.4 \, N$ $HCl$ and $50 \, mL$ of $0.2 \, N$ $NaOH$ solutions are mixed,the $pH$ of the resulting solution will be ........

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

When an aqueous solution of a strong acid with $pH = 5$ is mixed with an equal volume of an aqueous solution of a strong acid with $pH = 3$,what will be the $pH$ of the resulting solution?

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:

$100 \, mL$ of $0.04 \, N \, HCl$ aqueous solution is mixed with $100 \, mL$ of $0.02 \, N \, NaOH$ solution. The $pH$ of the resulting solution is

The $pH$ value of which one of the following is not equal to $1$?