In the wet tests for identification of various cations by...

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?

Options

A ${Fe}^{3 +}$
B ${Zn}^{2 +}$
C ${Co}^{2 +}$
D ${Ni}^{2 +}$

Correct answer

A. ${Fe}^{3 +}$

Step-by-step solution

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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