Chapter 16.1, Problem 1CP

Which of the following pairs of species are conjugate pairs? (Select all that apply.)

$\begin{array}{l}\text{a)}\hfill \\ {\text{H}}_{\text{2}}{\text{S and S}}^{\text{2-}}\hfill \\ \text{b)}\hfill \\ {\text{NH}}_{\text{2}}{\text{and NH}}_{\text{3}}\hfill \\ \text{c)}\hfill \\ {\text{O}}_{\text{2}}{\text{and H}}_{\text{2}}{\text{O}}_{\text{2}}\hfill \\ \text{d)}\hfill \\ {\text{HBr and Br}}^{\text{-}}\hfill \\ \text{e)}\hfill \\ {\text{HCl and OH}}^{\text{-}}\hfill \end{array}$