Regarding hydrochloric acid, incorrect statement is

$$\begin{gathered} \mathrm{The} \mathrm{reaction}, 2\mathrm{HCl}+{\mathrm{K}}_2{\mathrm{SO}}_4\to {\mathrm{H}}_2{\mathrm{SO}}_4+2\mathrm{KCl}, \mathrm{is} \mathrm{not} \mathrm{possible}; \\ \mathrm{HCl} \mathrm{is} \mathrm{a} \mathrm{weaker} \mathrm{and} \mathrm{more} \mathrm{volatile} \mathrm{acid} \mathrm{than} \mathrm{sulphuric} \mathrm{acid}; \\ \mathrm{It} \mathrm{cannot} \mathrm{be} \mathrm{used} \mathrm{to} \mathrm{prepare} \mathrm{sulphuric} \mathrm{acid} \mathrm{from} \mathrm{a} \mathrm{sulphate} \mathrm{salt}; \end{gathered}$$