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Terminology, ligands and denticity, EAN
JEE Main level
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Difficulty 2 of 3
cc016
The coordination number and the oxidation state of cobalt in
[
Co
(
en
)
X
2
(
C
X
2
O
X
4
)]
X
+
are respectively
A
6 and +1
B
6 and +3
C
6 and +2
D
4 and +3
Answer: B
Both en and oxalate are bidentate, so the coordination number is
2
×
2
+
2
=
6
. En is neutral and oxalate is
−
2
, so
x
+
0
−
2
=
+
1
gives
x
=
+
3
.
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