(Solved): Which of the following is an acid-base reaction? \[ \begin{array}{l} \mathrm{MgSO}_{4}(\mathrm{aq}) ...

Which of the following is an acid-base reaction? \[ \begin{array}{l} \mathrm{MgSO}_{4}(\mathrm{aq})+\mathrm{Ba}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq}) \rightarrow \mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq})+\mathrm{BaSO}_{4}(\mathrm{~s}) \\ \mathrm{Fe}(\mathrm{s})+2 \mathrm{AgNO}_{3}(\mathrm{aq}) \rightarrow 2 \mathrm{Ag}(\mathrm{s})+\mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq}) \end{array} \] none of these are acid-base reactions. \( 2 \mathrm{HClO}_{4}(\mathrm{aq})+\mathrm{Ca}(\mathrm{OH})_{2}(\mathrm{aq}) \rightarrow 2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{Ca}\left(\mathrm{ClO}_{4}\right)_{2}(\mathrm{aq}) \) \[ \mathrm{C}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g}) \]