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Net ionic equations

AP.Chem: TRA‑1 (EU), TRA‑1.B (LO), TRA‑1.B.1 (EK), TRA‑1.B.2 (EK), TRA‑1.B.3 (EK)
You might need: Periodic table

Problem

CrX2(SOX4)X3(aq)+3(NHX4)X2COX3(aq)CrX2(COX3)X3(s)+3(NHX4)X2SOX4(aq)\ce{Cr2(SO4)3}(aq) + \ce{3(NH4)2CO3}(aq) → \ce{Cr2(CO3)3}(s) + \ce{3(NH4)2SO4}(aq)
Which of the following correctly identifies the spectator ions in the reaction represented above?
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