Upon treatment with ammoniacal H_2S,the metal | vedclass

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(D) Ammoniacal $H_2S$ is the group reagent for the fourth group of cationic radicals in qualitative analysis.$Fe^{3+}$ and $Al^{3+}$ belong to the thi

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$Zn(II)$

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(D) Ammoniacal $H_2S$ is the group reagent for the fourth group of cationic radicals in qualitative analysis.$Fe^{3+}$ and $Al^{3+}$ belong to the third group and precipitate as hydroxides,$Fe(OH)_3$ and $Al(OH)_3$,in the presence of $NH_4OH$ and $NH_4Cl$.$Mg^{2+}$ does not precipitate with $H_2S$ in the presence of $NH_4OH$.$Zn^{2+}$ belongs to the fourth group and reacts with $H_2S$ in the presence of $NH_4OH$ to form a white precipitate of $ZnS$.

Upon treatment with ammoniacal $H_2S$,the metal ion that precipitates as a sulfide is

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