Heating an aqueous solution of aluminium chloride to dryness will give

Which among the following salts turns red litmus blue in its aqueous solution?

$A$ weak acid with $pK_a$ $5.9$ and a weak base with $pK_b$ $5.8$ are mixed in equal proportions. The $pH$ of the resulting solution is:

The $pK_a$ of a weak acid $(HA)$ and $pK_b$ of a weak base $(BOH)$ are $3.2$ and $3.4,$ respectively. The $pH$ of their salt $(AB)$ solution is

The correct formula for the $pK_h$ value of a salt formed from a weak acid and a weak base is .....

The $pH$ of water is $7$. When a substance $Y$ is dissolved in water,the $pH$ becomes $13$. The substance $Y$ is a salt of......