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Qualitative Analysis: Cations
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Group V and VI cations (Ba, Sr, Ca, Mg) and NH4+
NEET level
Single correct option
Difficulty 1 of 3
qc204
Nessler's reagent is
A
acidified
K
X
2
Cr
X
2
O
X
7
B
ammoniacal
AgNO
X
3
C
alkaline
KMnO
X
4
D
alkaline
K
X
2
[
HgI
X
4
]
Answer: D
Nessler's reagent is an alkaline solution of potassium tetraiodomercurate(II),
K
X
2
[
HgI
X
4
]
, used to detect
NH
X
4
X
+
as a brown precipitate or colour.
Practice Qualitative Analysis: Cations
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