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Standard XII
Chemistry
Chemical Properties of Boron Family
(1) what is t...
Question
(1) what is the Oxidation no. Of Co,Fe,Ni in [Co(NH3)6]3+,[Fe(CN)6]4- and [Ni(Co)4]?How? (2) Coordination no. Of [Fe(C2O4)3]3- and [Co(en)3]3+?How?
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Q.
Assertion :Coordination number of
F
e
and
C
o
in
[
F
e
(
C
2
O
4
)
3
]
3
−
a
n
d
[
C
o
(
e
n
)
3
]
3
+
respectively is 6 Reason:
C
2
O
2
−
4
and en (ethane -1, 2-diamine) are didentate ligands.
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.
Oxidation number, coordination no. &
effective atomic no. of ‘Fe’ in
K
4
[
F
e
(
C
N
)
6
]
is
Q.
(i) Write the IUPAC name of the complex
[
C
r
(
N
H
3
)
4
C
l
2
]
C
l
.
(ii) What type of isomerism is exhibited by the complex
[
C
o
(
e
n
)
3
]
3
+
?
(en = ethane-1, 2-diamine)
(iii) Why is
[
N
i
C
l
4
]
2
−
paramagnetic but
[
N
i
(
C
O
)
4
]
is diamagnetic ?
(At. nos. : Cr = 24, Co = 27, Ni =28)
Q.
The correct increasing order of wavelengths of absorption in the visible region for the complexes of
C
o
3
+
is:
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