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Redox Reactions
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Oxidation number rules and unusual cases
JEE Main level
One or more correct options
Difficulty 2 of 3
rx033
In which of the following does the metal have oxidation number
+
2
? (NH3 and en are neutral.) Select all correct options.
A
Ni in
[
Ni
(
NH
X
3
)
X
6
]
Cl
X
2
B
Fe in
K
X
4
[
Fe
(
CN
)
X
6
]
C
Cu in
[
Cu
(
NH
X
3
)
X
4
]
SO
X
4
D
Co in
[
Co
(
NH
X
3
)
X
6
]
Cl
X
3
Answer: A, B, C
The first has two
Cl
X
−
outside, so Ni is
+
2
. In
[
Fe
(
CN
)
X
6
]
X
4
−
, Fe is
+
2
. The sulfate balances Cu at
+
2
. In
[
Co
(
NH
X
3
)
X
6
]
Cl
X
3
, Co is
+
3
.
Practice Redox Reactions
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