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Question

Arrange the following in order of decreasing NO bond length :


NO+2,NO2,NO3.

A
NO3>NO+2>NO2
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B
NO3>NO2>NO2+
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C
NO2+>NO3>NO2
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D
NO2>NO3>NO2+
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Solution

The correct option is B NO3>NO2>NO2+

To answer this question, firstly we have to calculate the bond orders. The higher the bond order is, shorter the bond length.

Nitrogen atom has 2+5=7 electrons

Oxygen atom has 2+6=8 electrons

Now NO has 6 electrons in the bonding and 1 in the antibonding.

NO+2 has 2 electrons lesser than NO; So 6 electrons in the bonding and no electrons in the antibonding.

Thus, NO+2,Bond Order=602=3

For NO2, Band order=632=1.5

For NO3, Band order=642=1

The order of Band order is :

NO3> NO2> NO+2

Hence the correct option is B.

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