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(a) Why does NO2 dimerise ? (b) In wha...

(a) Why does `NO_2` dimerise ?
(b) In what way can it be proved that `PH_3` is basic in nature ?

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`NO_(2)` molecule has odd number of valence electrons `(5+6+6=17)`. By dimerisation, it changes to `N_(2)O_(4)` and the valence electrons become even. The molecule becomes stable.
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