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KCET 2021 Chemistry Solved Paper
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© examsnet.com
Question : 48
Total: 60
Which one of the following is correct for all elements from Sc to Cu?
The lowest oxidation state shown by them is
+
2
4
s
orbital is completely filled in the ground state
3
d
orbital is not completcly filled in the ground slate
The ions in
+
2
nxidation states are paramagnetic
Validate
Solution:
From
Sc
2
+
to
Cu
2
+
all the ions are paramagnetic in nature as they all contain unpaired electrons as shown below.
Elements
Electronic configuration
Number of unpaired electron (s)
Sc
2
+
[
Ar
]
3
d
1
1
Ti
2
+
[
Ar
]
3
d
2
2
V
2
+
[
Ar
]
3
d
3
3
Cr
2
+
[
Ar
]
3
d
4
4
Mn
2
+
[
Ar
]
3
d
5
5
Fe
2
+
[
Ar
]
3
d
6
6
Co
2
+
[
Ar
]
3
d
7
7
Ni
2
+
[
Ar
]
3
d
8
8
Cu
2
+
[
Ar
]
3
d
9
9
© examsnet.com
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