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Among the following species, the number ...

Among the following species, the number of paramagnetic species:
`NO , He , C ^(4+) Be ^(2+) O _(2) ^(-), O ^(- ) , B _(2), N _(2) ^(+), Li ^(+) , N `

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The correct Answer is:
6
Paramagnetic :
`NO , O _(2) ^(-) O ^(-), B_(2), N _(2) ^(+), N`
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NTA MOCK TESTS-NTA TPC JEE MAIN TEST 43 -CHEMISTRY
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