Answer:
The correct answer is [tex]CrO^{2-} _{4}[/tex] and [tex]Ba^{2+}[/tex]
Explanation:
A "spectator ion" is an ion that exists as a reagent and as a product in a chemical reaction. This ion has the particularity of not affecting the equilibrium.
In this case, the two components that do not see their charges modified on both sides of the reaction are [tex]CrO^{2-} _{4}[/tex] and [tex]Ba^{2+}[/tex]
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