If a solution has $pOH$ value $12$ at $25\,^{\circ}C$,$H^{+}$ concentration should be

Which equation represents the calculation of the ionic product for distilled water?

When a large amount of water is added to a solution of $BiCl_3$,then........

The $pH$ of human blood is $7.4$. The $[H^{+}]$ concentration will be:

At a certain temperature $T$,if the conductivity of pure water is $5.5 \times 10^{-7} \ S \ cm^{-1}$,calculate the $pH$ of water at the given temperature. Given: $\lambda_{H^{+}}^\infty = 350 \ S \ cm^2 \ eq^{-1}$ and $\lambda_{OH^{-}}^\infty = 200 \ S \ cm^2 \ eq^{-1}$.

Observe the following solutions:
$I$. Black coffee
$II$. $0.2 \ M \ NaOH$
$III$. Lemon juice
$IV$. Lime water
$V$. Human saliva
$VI$. Tomato juice
The number of solutions having $pH$ range of $1-7$ and $7-14$,in the above list,is respectively.