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JEE Main Chemistry Class 11 Chemical Bonding and Molecular Structure Part 1 Questions
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© examsnet.com
Question : 42
Total: 100
Which of the following species is not paramagnetic?
[2017]
N
O
C
O
O
2
B
2
Validate
Solution:
N
O
→
One unpaired electron is present in
π
*
molecular orbit,
hence paramagnetic.
(b)
C
O
(
14
)
→
K
K
σ
2
s
2
π
2
p
x
2
=
π
2
p
y
2
σ
2
p
z
2
σ
*
2
s
2
No unpaired electron, hence diamagnetic.
(c)
O
2
(
16
)
→
K
K
σ
2
s
2
σ
*
2
s
2
σ
2
p
z
2
π
2
p
x
2
=
π
2
p
y
2
π
*
2
p
x
1
=
π
*
2
p
y
1
Two unpaired electrons, hence paramagnetic.
(d)
B
2
(
10
)
→
K
K
σ
2
s
2
σ
*
2
s
2
π
2
p
x
1
=
π
2
p
y
1
B
2
contains two unpaired electrons, hence paramagnetic.
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