Question

Select incorrect statement:

• A. $O_{3}$ and $O_{2}^{2 -}$ both are diamagnetic
• B. Out of $O_{2},O_{2}^{+},O_{3}$ least $O-O$ bond length is in $O_{2}^{+}$
• C. Out of $O_{2},O_{2}^{+},O_{2}^{-}$ only $O_{2}$ is paramagnetic
• D. Out of $O_{2},O_{2}^{+},O_{2}^{-}$ maximum spin magnetic moment is of $O_{2}$

Answer 1

Answer: (C)

$O_{2},$ $O_{2}^{-}$ and $O_{2}^{+}$ are paramagnetic.
If unpaired electrons are present in an ion or molecule, then it is paramagnetic. If all electrons are paired, then the ion or molecule is diamagnetic.