Which of the given statements are correct?

A solution is prepared by mixing of acetic acid $\left({\mathrm{K}}_{\mathrm{a}}=2\times \right.{10}^{-5})$ and $\mathrm{HCl}$. In the mixture acetic acid is $0.2 \mathrm{M}$ and $\mathrm{HCl}$ is $0.1 \mathrm{M}$.

Calculate $\mathrm{pH}$ of $0.2 \mathrm{M}$ acetic acid and its degree of dissociation before addition $\mathrm{HCl}$.

A solution is prepared by mixing of acetic acid $\left({\mathrm{K}}_{\mathrm{a}}=2\times \right.{10}^{-5})$ and $\mathrm{HCl}$. In the mixture acetic acid is $0.2 \mathrm{M}$ and $\mathrm{HCl}$ is $0.1 \mathrm{M}$.

Calculate degree of dissociation of acetic acid in the final solution.

A solution is prepared by mixing of acetic acid $\left({\mathrm{K}}_{\mathrm{a}}=2\times \right.{10}^{-5})$ and $\mathrm{HCl}$. In the mixture acetic acid is $0.2 \mathrm{M}$ and $\mathrm{HCl}$ is $0.1 \mathrm{M}$. Calculate

${\mathrm{CH}}_3{\mathrm{COO}}^{-}$ ion concentration in final solution.

A solution is prepared by mixing of acetic acid $\left({\mathrm{K}}_{\mathrm{a}}=2\times \right.{10}^{-5})$ and $\mathrm{HCl}$. In the mixture acetic acid is $0.2 \mathrm{M}$ and $\mathrm{HCl}$ is $0.1 \mathrm{M}$. Calculate

$\%$ decrease of $\mathrm{\alpha }$ of acetic acid due to common ion effect.

Calculate the solubility of silver phosphate $\left({\mathrm{Ag}}_3{\mathrm{PO}}_4\right)$ in $\mathrm{mg}/\mathrm{mL}$ in pure water. $\left[{\mathrm{K}}_{\mathrm{sp}} \mathrm{of} \left({\mathrm{Ag}}_3{\mathrm{PO}}_4\right)=2.7\times {10}^{-23}\right]$

Calculate silver phosphate's solubility $\left({\mathrm{Ag}}_3{\mathrm{PO}}_4\right)$ in $\mathrm{mg}/\mathrm{mL}$ in a solution that is $0.02 \mathrm{M} inAg{\mathrm{NO}}_3$. $\left[{\mathrm{K}}_{\mathrm{sp} }\mathrm{of} \left({\mathrm{Ag}}_3{\mathrm{PO}}_4\right)=2.7\times {10}^{-23}\right]$.