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(B) In the systematic qualitative analysis of cations,the group reagents are used to precipitate specific groups of cations.Group $IV$ cations ($Co^{2

Vedclass · Accepted Answer

$NH_4Cl + NH_4OH + H_2S$

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(B) In the systematic qualitative analysis of cations,the group reagents are used to precipitate specific groups of cations.Group $IV$ cations ($Co^{2+}$,$Ni^{2+}$,$Mn^{2+}$,$Zn^{2+}$) are precipitated as their sulfides.The group reagent for Group $IV$ is $H_2S$ gas in the presence of $NH_4Cl$ and $NH_4OH$ (ammoniacal medium).Therefore,the correct combination is $NH_4Cl + NH_4OH + H_2S$.

Which reagents are used for the identification of Group $IV$ cations?

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