Chapter 9, Problem 4SEPP

These questions are not based on a descriptive passage.

Which of the following are paramagnetic?

${\text{O}}_2^{2-}$ ${\text{O}}_2^{-}$ ${\text{O}}_2^{+}$ ${\text{O}}_2^{2+}$

I II III IV

a)

I and II

b)

II and III

c)

III and IV

d)

I and III