Which one is paramagnetic from following

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4.Chemical Bonding and Molecular Structure

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Which one is paramagnetic from the following

A

$O_2^ - $

B

$NO$

C

Both $(a)$ and $(b)$

D

$C{N^ - }$

(IIT-1989) (AIPMT-1995)

Solution

(c) $O_2^ – \,(2 \times 8 + 1 = 17)$ has odd number of electrons and hence it is paramagnetic.

All the remaining molecules/ions, i.e.,

$C{N^ – }(6 + 7 + 1 = 14)$ diamagnetic

$NO(7 + 8 = 15)$ has odd number of electrons and hence it is paramagnetic.

Standard 11

Chemistry

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