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Class 12 NEET Chemistry D And F Block Elements Questions
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© examsnet.com
Question : 54
Total: 108
Which of the following ions has electronic configuration
[
A
r
]
3
d
6
?
(At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)
(2010)
N
i
3
+
M
n
3
+
F
e
3
+
C
o
3
+
Validate
Solution:
The electronic configuration of the given ions is :
N
i
3
+
:
[
A
r
]
3
d
7
4
s
0
,
M
n
3
+
:
[
A
r
]
3
d
4
4
s
0
F
e
3
+
:
[
A
r
]
3
d
5
4
s
0
,
C
o
3
+
;
[
A
r
]
3
d
6
4
s
0
.
Thus
C
o
3
+
is the ion with the desired configuration.
© examsnet.com
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