In a solution of $pH = 5$,more acid is added in order to reduce the $pH$ to $2$. The increase in hydrogen ion concentration is $......$ times.

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

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?

An analyst wants to convert $1 \ L$ of $HCl$ solution with $pH = 1$ to a solution of $HCl$ with $pH = 2$. The volume of water needed to do this dilution is $...... \ mL$. (Nearest Integer)

What will be the $pH$ of a solution formed by mixing $40 \, mL$ of $0.10 \, M \, HCl$ with $10 \, mL$ of $0.45 \, M \, NaOH$?

If $10^{-6} \ M \ HCl$ is diluted $100$ times,its $pH$ will be: