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AIEEE 2004 Chemistry Solved Paper
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© examsnet.com
Question : 12
Total: 75
The bond order in NO is
2.5
while that in
NO
+
is 3 . Which of the following statements is true for these two species?
Bond length in
NO
+
is greater than in
NO
Bond length is unpredictable
Bond length in
NO
+
in equal to that in
NO
Bond length in
NO
is greater than in
NO
+
Validate
Solution:
Molecular orbital configuration of NO (15 electrons) is
σ
1
s
2
σ
1
s
2
*
σ
2
s
2
σ
2
s
2
*
σ
2
p
z
2
π
2
p
z
2
=
π
2
p
y
2
π
2
p
x
1
*
=
π
2
p
y
o
*
∴
N
b
=
10
N
a
=
5
∴
B
O
=
1
2
[
10
−
5
]
=
2.5
Similarly Molecular orbital configuration of
NO
+
( 14 electrons) is
σ
1
s
2
σ
1
s
2
*
σ
2
s
2
σ
2
s
2
*
σ
2
p
z
2
π
2
p
x
2
=
π
2
p
y
2
∴
N
b
=
10
N
a
=
4
∴
B
O
=
1
2
[
10
−
4
]
=
3
Note :
(2) Bond length
∝
1
Bond order
So, bond length in
NO
>
NO
+
© examsnet.com
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