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Qualitative Analysis: Cations
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Group IV cations (Zn, Mn, Ni, Co)
NEET level
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Difficulty 1 of 3
qc065
Among the following, the hydroxide that dissolves in excess
NaOH
to give a clear solution is
A
Fe
(
OH
)
X
3
B
Zn
(
OH
)
X
2
C
Ni
(
OH
)
X
2
D
Mn
(
OH
)
X
2
Answer: B
Zn
(
OH
)
X
2
is amphoteric:
Zn
(
OH
)
X
2
+
2
OH
X
−
[
Zn
(
OH
)
X
4
]
X
2
−
. The hydroxides of Mn(II), Fe(III) and Ni(II) do not dissolve in excess NaOH.
Practice Qualitative Analysis: Cations
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