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 $ZnS$.

List-$I$ (Ion)	List-$II$ (Group Number in Cation Analysis)
$A. Co^{2+}$	$I. Group-I$
$B. Mg^{2+}$	$II. Group-III$
$C. Pb^{2+}$	$III. Group-IV$
$D. Al^{3+}$	$IV. Group-VI$

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

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Match List-$I$ with List-$II$:

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$A. Co^{2+}$ $I. Group-I$

$B. Mg^{2+}$ $II. Group-III$

$C. Pb^{2+}$ $III. Group-IV$

$D. Al^{3+}$ $IV. Group-VI$

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$AlCl_3 + Na_3PO_4 \longrightarrow AlPO_4 \downarrow$

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