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

Classify salts based on their hydrolysis and provide examples for each category.

The degree of hydrolysis of a salt of weak acid and weak base in its $0.1 \, M$ solution is found to be $50 \%$. If the molarity of the solution is $0.2 \, M$,the percentage hydrolysis of the salt should be $...... \%$.

If the dissociation constants of ammonium hydroxide $(NH_4OH)$ and acetic acid $(CH_3COOH)$ are both $1.8 \times 10^{-5}$ and $K_w = 10^{-14}$,what is the degree of hydrolysis of $CH_3COONH_4$?

Match the column $I$ with column $II$ and mark the appropriate choice.

Column $I$	Column $II$
$A$. $CH_3COONa$	$i$. Almost neutral,$pH > 7$ or $< 7$
$B$. $NH_4Cl$	$ii$. Acidic,$pH < 7$
$C$. $NaNO_3$	$iii$. Alkaline,$pH > 7$
$D$. $CH_3COONH_4$	$iv$. Neutral,$pH = 7$

$pK_a$ of acetic acid is $4.74$. The concentration of $CH_3COONa$ is $0.01 \ M$. The $pH$ of $CH_3COONa$ is