If the $pH$ of an aqueous solution is $6$,then its $pOH$ is:

In a basic aqueous solution,if the concentration of $[OH^-]$ increases,what happens to the $pOH$?

$(a)$ $A$ salt is produced by the reaction between an acid and a base. Identify the acid and the base from which the following salts have been formed:
$(i)$ $Na_{2}SO_{4}$
$(ii)$ $NH_{4}Cl$
$(iii)$ $KNO_{3}$
$(iv)$ $NaCl$

The compound which is used in glass, soap, and paper industries is:

Three acidic solutions $A, B$ and $C$ have $pH = 0, 3$ and $5$ respectively.
$(i)$ Which solution has the highest concentration of $H^{+}$ ions?
$(ii)$ Which solution has the lowest concentration of $H^{+}$ ions?

Which of the following is not a strong acid?