Number of paramagnetic oxides among the following given oxides is ______. $Li_2O, CaO, Na_2O_2, KO_2

Question

Number of paramagnetic oxides among the following given oxides is ______. $Li_2O, CaO, Na_2O_2, KO_2, MgO$ and $K_2O$

Professor PC Thomas Classes · Answer

Only $KO_2$ (potassium superoxide) contains the paramagnetic superoxide ion ($O_2^-$). The rest are diamagnetic oxides or peroxides.