Which of the following is used in the preparation of chlorine?

Both $\mathrm{MnO}_{2}$ and $\mathrm{KMnO}_{4}$ used for the preparation of chlorine by the action of conc. $\mathrm{HCl}$$\begin{array}{l}\mathrm{MnO}_{2}+4 \mathrm{HCl} \rightarrow \mathrm{MnCl}_{2}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{Cl}_{2}\\ 2 \mathrm{KMnO}_{4}+16 \mathrm{HCl} \rightarrow2 \mathrm{KCl}+2 \mathrm{MnCl}_{2}\\ +8 \mathrm{H}_{2} \mathrm{O}+5 \mathrm{Cl}_{2} \end{array}$$$Chlorine is not obtained by dil.$\mathrm{HCl}\mathrm{Ag}_{2} \mathrm{ S}_{2} \mathrm{O}_{3}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Ag}_{2} \mathrm{ S}+\mathrm{H}_{2} \mathrm{SO}_{4}$