A precipitation reaction occurs when a solution containing a cation (red spheres) and a solution containing an anion (green spheres) are mixed. The spectator ions have been omitted from the diagram for clarity.
Which set of reaclants best represents the diagram?
\( \mathrm{Li}_{2} \mathrm{SO}_{4}(\mathrm{aq})+\mathrm{AgNO}_{3}(\mathrm{aq}) \)
\( \mathrm{NaClO}_{4}(\mathrm{aq})+\mathrm{CaCl}_{2}(\mathrm{aq}) \)
\( \mathrm{KNO}_{3}(\mathrm{aq})+\mathrm{CuCl}_{2}(\mathrm{aq}) \)
\( \mathrm{NH}_{4} \mathrm{Br}(\mathrm{aq})+\mathrm{Pb}\left(\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{O}_{2}\right)_{2}(\mathrm{aq}) \)
Write the net ionic equation for the reaction. Include physical states.
net ionic equation: \( \square \)