$A$ solution has $[H^{+}] = 0.001 \ M$. What is the value of $[OH^{-}]$?

An aqueous solution tends to have a $p^H$ of $0$. Then the solution will be .....

When $pH$ of a solution decreases,its hydrogen ion concentration

At a certain temperature,if $pK_w = 12.60$,then which of the following is correct for an acidic solution?

At $25 \, ^\circ C$,the ionic product of water $(K_w)$ is equal to .......

At $90\,^oC$,pure water has $[H^{+}] = 10^{-6}\,M$. If $100\, mL$ of $0.2\, M\, HCl$ is added to $200\, mL$ of $0.1\, M\, KOH$ at $90\,^oC$,then the $pH$ of the resulting solution will be: