Question

The paramagnetic species is

• A. $KO _{2}$
• B. $SiO _{2}$
• C. $TiO _{2}$
• D. $BaO _{2}$

Answer 1

Answer: (A)

$KO _{2}$

Answer 2

$KO_2$ is a superoxide of potassium containing superoxide ion, $O_{2-}$ which has a three electron bond. Thus this ion can be represented as The presence of one unpaired electron in three electron bond makes this ion paramagnetic.