When $10 \, mL$ of $0.1 \, M$ acetic acid $(pK_a = 5.0)$ is titrated against $10 \, mL$ of $0.1 \, M$ ammonia solution $(pK_b = 5.0)$,the equivalence point occurs at $pH$:

Which will not affect the degree of ionisation?

The percentage of ionization of $1 \ L$ of $x \ M$ acetic acid is $4.242$ and is called solution "$A$". The percentage of ionization of $1 \ L$ of $y \ M$ acetic acid is $3$ and is called solution "$B$". Solution "$A$" is mixed with solution "$B$". What is the concentration of acetic acid in the resultant solution (in $M$)? $\left(K_{a} \text{ of acetic acid } = 1.8 \times 10^{-5}\right)$

When a standard solution of $NaOH$ is left in the air for a few hours,

Identify the correct statements from the following.
$(A)$ The ionic product of water at $100^{\circ} C$ is $< 10^{-14}$.
$(B)$ $pH$ of a solution decreases with increasing temperature.
$(C)$ $NaH_2PO_4$ on hydrolysis gives a basic solution.
$(D)$ $NH_3$ can act both as Bronsted acid and base.

Arrange the following solutions in the decreasing order of $pOH$:
$A$. $0.01 \ M \ HCl$
$B$. $0.01 \ M \ NaOH$
$C$. $0.01 \ M \ CH_3COONa$
$D$. $0.01 \ M \ NaCl$