Which of the following is incorrectly matched?

CHEMISTRY · Single correct · A Level · Chemistry · Transition metals and their chemistry · Transition metals and their chemistry

Problem

Which of the following is incorrectly matched? (1)

[\text{FeF}_6]^{3-}

| 5 (2)

[\text{Cr}(\text{en})_3]^{2+}

| 2 (3)

[\text{Co}(\text{NH}_3)_6]^{3+}

| 4 (4)

[\text{Mn}(\text{H}_2\text{O})_6]^{2+}

| 5