Match the List-I with List-II : Cations Group reaction $P\rightarrow {\mathrm{Pb}}^{2+},{\mathrm{Cu}}^{2+}$ ${H}_{2}S$ gas in presence of dilute $\mathrm{HCl}$ $Q\rightarrow {\mathrm{Al}}^{3+},{\mathrm{Fe}}^{3+}$ ${({\mathrm{NH}}_{4})}_{2}{\mathrm{CO}}_{3}$ in presence of ${\mathrm{NH}}_{4}\mathrm{OH}$ $R\rightarrow {\mathrm{Co}}^{2+},{\mathrm{Ni}}^{2+}$ ${\mathrm{NH}}_{4}\mathrm{OH}$ in presence of ${\mathrm{NH}}_{4}\mathrm{CI}$ $S\rightarrow {\mathrm{Ba}}^{2+},{\mathrm{Ca}}^{2+}$ ${H}_{2}S$ in presence of ${\mathrm{NH}}_{4}\mathrm{OH}$

Group reagents for precipitating ions: Group Cations Group reagent Zero ${\mathrm{NH}}_{4}^{+}$ None I ${\mathrm{Pb}}^{2+}$ Dilute HCl II ${\mathrm{Pb}}^{2+},{\mathrm{Cu}}^{2+},{\mathrm{As}}^{3+}$ ${H}_{2}S$ gas in presence of dil. HCl III ${\mathrm{Al}}^{3+},{\mathrm{Fe}}^{3+}$ ${\mathrm{NH}}_{4}\mathrm{OH}$ in presence of ${\mathrm{NH}}_{4}\mathrm{Cl}$ IV ${\mathrm{Co}}^{2+},{\mathrm{Ni}}^{2+},{\mathrm{Mn}}^{2+},{\mathrm{Zn}}^{2+}$ ${H}_{2}S$ in presence of ${\mathrm{NH}}_{4}\mathrm{OH}$ V ${\mathrm{Ba}}^{2+},{\mathrm{Sr}}^{2+},{\mathrm{Ca}}^{2+}$ $({\mathrm{NH}}_{4}{)}_{2}{\mathrm{CO}}_{3}$ in presence of ${\mathrm{NH}}_{4}\mathrm{OH}$ VI ${\mathrm{Mg}}^{2+}$ None So, the correct answer is $P\rightarrow i,Q\rightarrow \mathrm{iii},R\rightarrow \mathrm{iv},S\rightarrow \mathrm{ii}$

Match the List-I with List-II : Cations… - JEE Main 2023 Chemistry PYQ

JEE Main 2023 — Chemistry Inorganic Chemistry

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Match the List-I with List-II :

Cations	Group reaction
$P\rightarrow {\mathrm{Pb}}^{2+},{\mathrm{Cu}}^{2+}$	${H}_{2}S$ gas in presence of dilute $\mathrm{HCl}$
$Q\rightarrow {\mathrm{Al}}^{3+},{\mathrm{Fe}}^{3+}$	${({\mathrm{NH}}_{4})}_{2}{\mathrm{CO}}_{3}$ in presence of ${\mathrm{NH}}_{4}\mathrm{OH}$
$R\rightarrow {\mathrm{Co}}^{2+},{\mathrm{Ni}}^{2+}$	${\mathrm{NH}}_{4}\mathrm{OH}$ in presence of ${\mathrm{NH}}_{4}\mathrm{CI}$
$S\rightarrow {\mathrm{Ba}}^{2+},{\mathrm{Ca}}^{2+}$	${H}_{2}S$ in presence of ${\mathrm{NH}}_{4}\mathrm{OH}$

Official previous-year question

Held on 25 Jan 2023 · Verified 6 Jul 2026.

Options

A
$P\rightarrow i,Q\rightarrow \mathrm{iii},R\rightarrow \mathrm{ii},S\rightarrow \mathrm{iv}$
B
$P\rightarrow \mathrm{iv},Q\rightarrow \mathrm{ii},R\rightarrow \mathrm{iii},S\rightarrow i$
C
$P\rightarrow \mathrm{iii},Q\rightarrow i,R\rightarrow \mathrm{iv},S\rightarrow \mathrm{ii}$
D
$P\rightarrow i,Q\rightarrow \mathrm{iii},R\rightarrow \mathrm{iv},S\rightarrow \mathrm{ii}$

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Solution

Group reagents for precipitating ions:

Group	Cations	Group reagent
Zero	${\mathrm{NH}}_{4}^{+}$	None
I	${\mathrm{Pb}}^{2+}$	Dilute HCl
II	${\mathrm{Pb}}^{2+},{\mathrm{Cu}}^{2+},{\mathrm{As}}^{3+}$	${H}_{2}S$ gas in presence of dil. HCl
III	${\mathrm{Al}}^{3+},{\mathrm{Fe}}^{3+}$	${\mathrm{NH}}_{4}\mathrm{OH}$ in presence of ${\mathrm{NH}}_{4}\mathrm{Cl}$
IV	${\mathrm{Co}}^{2+},{\mathrm{Ni}}^{2+},{\mathrm{Mn}}^{2+},{\mathrm{Zn}}^{2+}$	${H}_{2}S$ in presence of ${\mathrm{NH}}_{4}\mathrm{OH}$
V	${\mathrm{Ba}}^{2+},{\mathrm{Sr}}^{2+},{\mathrm{Ca}}^{2+}$	$({\mathrm{NH}}_{4}{)}_{2}{\mathrm{CO}}_{3}$ in presence of ${\mathrm{NH}}_{4}\mathrm{OH}$
VI	${\mathrm{Mg}}^{2+}$	None

So, the correct answer is

P\rightarrow i,Q\rightarrow \mathrm{iii},R\rightarrow \mathrm{iv},S\rightarrow \mathrm{ii}

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