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4.Chemical Bonding and Molecular Structure
medium
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
