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Find the number of molecules / ions whic...

Find the number of molecules / ions which are having unpaired electron in its antibonding molecular orbital.
`O _(2) , N _(2) , NO , N _(2) ^(+) , O _(2) ^(+) , O _(2) ^(-) , O _(2) ^(2+)`

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` O _(2) , NO , O _(2)^(+) , O _(2) ^(-)`
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