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Qualitative Analysis: Cations
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Group V and VI cations (Ba, Sr, Ca, Mg) and NH4+
JEE Main level
Single correct option
Difficulty 2 of 3
qc126
Nessler's reagent is correctly described as
A
a solution of
HgCl
X
2
in aqueous ammonia
B
a solution of
Hg
X
2
I
X
2
in dilute
HNO
X
3
C
an alkaline solution of
K
X
2
[
HgI
X
4
]
(potassium tetraiodomercurate(II) with
KOH
)
D
an acidic solution of
KI
and
I
X
2
Answer: C
Nessler's reagent is
K
X
2
HgI
X
4
made alkaline with
KOH
. With ammonia it gives the brown product:
2
K
X
2
HgI
X
4
+
NH
X
3
+
3
KOH
HgO
⋅
Hg
(
NH
X
2
)
I
+
7
KI
+
2
H
X
2
O
.
Practice Qualitative Analysis: Cations
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