Consider the reaction when aqueous solutions of ammonium carbonate and chromium(III) chloride are combined. The net ionic equation for this reaction is:

Explanation:

Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.

The balanced molecular equation is:

The equation can be written in terms of ions as:

The ions which are present on both the sides of the equation are ammonium and chloride ions and hence are not involved in net ionic equation.

Hence, the net ionic equation is

4d^55s^1 ( third choice)