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(A) In qualitative inorganic analysis,cations are classified into groups based on their precipitation reactions with specific reagents.$Zn^{2+}$,$Co^{

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$Fe^{3+}$

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(A) In qualitative inorganic analysis,cations are classified into groups based on their precipitation reactions with specific reagents.$Zn^{2+}$,$Co^{2+}$,and $Ni^{2+}$ belong to group $IV$,which are precipitated as sulfides in the presence of $NH_4OH$ and $H_2S$.$Fe^{3+}$ belongs to group $III$,which is precipitated as a hydroxide in the presence of $NH_4Cl$ and $NH_4OH$.Therefore,$Fe^{3+}$ does not belong to group $IV$.

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

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