In the wet tests for identification of various cations by precipitation, which transition element cation doesn't belong to group IV in qualitative inorganic analysis?

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Cations are segregated in 5 groups depending upon their solubility with the help of various precipitating reagents. As per the segregation, ${Zn}^{2 +}, {Co}^{2 +}, {Ni}^{2 +}$ belongs to the 4th group and ${Fe}^{3 +}$ belongs to the 3rd group.

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