Question

Among the following, the paramagnetic compound is:

• A. $N{a}_2{O}_2$
• B. $O_3$
• C. $N_{2}O$
• D. $O_2^{-}$

Answer 1

Answer: (D)

Odd number electron generally indicates paramagnetic nature and even number of electron diamagnetic nature
${\text{O}}_2^{2-}\Rightarrow$ $18$ Electron diamagnetic.
${\text{O}}_3\Rightarrow$ $24$ Electron diamagnetic.
$N_{2}O$ ⇒ $22$ Electron diamagnetic.

${\text{O}}_2^{-}\Rightarrow$ $17$ Electrons one unpaired electron as per MOT. Hence, it is paramagnetic