The aqueous solution of sodium cyanide $(NaCN)$ is:

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

$A$ salt $X$ is dissolved in water $(pH = 7)$,and the resulting solution becomes alkaline in nature. The salt is made of:

If $pK_b$ for $CN^{-}$ at $25\,^{\circ}C$ is $3.7$,what is the $pH$ of a $0.5\, M$ aqueous $NaCN$ solution?

Which among the following salt solutions in water shows a $pH$ greater than $7$?

Explain the following with reasons:
$(i)$ $NaCl$ solution is neutral. The solution of strong acid and strong base salts is neutral.
$(ii)$ $NaCH_3COO$ solution is basic. The solution of strong base and weak acid salt is basic.
$(iii)$ $NH_4Cl$ solution is acidic. The solution of weak base and strong acid salt is acidic.
$(iv)$ The solution of $NH_4CH_3COO$ is (almost) neutral. The solution of weak acid - weak base salts is almost neutral.