Among $\mathrm{KO}_2, \mathrm{KAlO}_2, \mathrm{CaO}_2$ and $\mathrm{NO}_2^{+}$, unpaired electron is

Question

Among $\mathrm{KO}_2, \mathrm{KAlO}_2, \mathrm{CaO}_2$ and $\mathrm{NO}_2^{+}$, unpaired electron is present in :

Professor PC Thomas Classes · Answer

See detailed solution for explanation.