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Why does NO(2) dimerise ?...

Why does `NO_(2)` dimerise ?

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`NO_(2)` contains odd number of valence electrons. It be haves as a typical odd molecule. On dimerisation. It is converted to stable `N_(2)O_(4)` molecule with even number of electrons.
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-P-BLOCK ELEMENTS -INTEXT QUESTIONS
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