Q.In the Group IV analysis of cations ( $Zn^{2+}, Mn^{2+}, Ni^{2+}, Co^{2+}$ ), the reagent is $H_2S$ in the presence of:

NH_4OH

and

NH_4Cl

Dilute

HCl

Concentrated

HNO_3

Sodium hydroxide

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Q.In the Group IV analysis of cations (Zn2+,Mn2+,Ni2+,Co2+Zn^{2+}, Mn^{2+}, Ni^{2+}, Co^{2+}Zn2+,Mn2+,Ni2+,Co2+), the reagent is H2SH_2SH2​S in the presence of: