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Byju's Answer
Standard XII
Chemistry
CFSE in Octahedral and Tetrahedral Complexes
Which among t...
Question
Which among the following is not a low spin complex?
A
[
F
e
(
N
H
3
)
6
]
3
+
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B
[
F
e
(
C
N
)
6
]
3
−
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C
[
C
o
C
l
4
]
−
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D
[
N
i
(
C
N
4
)
]
2
−
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Solution
The correct option is
C
[
C
o
C
l
4
]
−
Here
N
H
3
a
n
d
C
N
−
are strong field ligands and
C
l
−
is weak field ligand. Weak field ligands form a high spin complex.
Thus,
[
C
o
C
l
4
]
−
is a high spin complex.
Thus the correct answer is C.
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Similar questions
Q.
[
F
e
(
C
N
)
6
]
−
3
is low spin complex but
[
F
e
(
H
2
O
)
6
]
+
3
is high spin complex. Explain.
Q.
How many in each of the following complexes obey the rule of
18
(EAN rule)?
(a)
[
C
u
(
N
H
3
)
4
]
2
+
,
[
C
u
(
e
n
)
3
]
2
+
,
[
C
u
(
C
N
)
4
]
3
−
(b)
[
F
e
(
C
N
)
6
]
4
−
,
[
F
e
(
C
N
)
6
]
3
−
,
F
e
(
C
O
)
6
(c)
[
N
i
(
N
H
3
)
6
]
2
+
,
[
N
i
(
C
N
)
4
]
2
−
,
[
N
i
(
C
O
)
4
]
(d)
[
C
r
(
N
H
3
)
6
]
3
+
,
[
C
r
(
C
O
)
6
]
(e)
[
C
o
(
N
H
3
)
6
]
3
+
,
[
C
o
C
l
4
]
2
−
Q.
The octahedral complex ions
[
F
e
C
l
6
]
3
−
and
[
F
e
(
C
N
)
6
]
3
−
are both paramagnetic but the former is high spin and the latter is low spin. In the l
ow spin complex,
[
F
e
(
C
N
)
6
]
3
−
has the d-configuration as
:
Q.
The correct order of magnetic moment (spin only values in B.M.) among is: (Atomic no.s :
M
n
=
25
;
F
e
=
26
;
C
o
=
27
)
Q.
The correct order of the spin only magnetic moment of metal ions in the following low spin complexes,
[
V
(
C
N
)
6
]
4
−
,
[
F
e
(
C
N
)
6
]
4
−
,
[
R
u
(
N
H
3
)
6
]
3
+
and
[
C
r
(
N
H
3
)
6
]
2
+
is:
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