Chapter 13, Problem 13.65AQAP

According to Le Châtelier’s principle, does the equilibrium shill in the direction of products or reactants when ${\text{O}}_{\text{2}}$ is added to the equilibrium mixture of each of the following reactions? (10.5)

a ${\text{3O}}_{\text{2}}\left(g\right) \rightleftharpoons {\text{2O}}_{\text{3}}\left(g\right)$
b ${\text{2CO}}_{\text{2}}\left(g\right) \rightleftharpoons \text{2CO}\left(g\right)+{\text{O}}_{\text{2}}\left(g\right)$
c ${\text{2SO}}_{\text{2}}\left(g\right)+{\text{O}}_{\text{2}}\left(g\right) \rightleftharpoons {\text{2SO}}_{\text{3}}\left(\text{g}\right)$
d ${\text{2SO}}_{\text{2}}\left(g\right){\text{+2H}}_{\text{2}}\text{O}\left(g\right)\rightleftharpoons {\text{H}}_{\text{2}}\text{S}\left(g\right)+{\text{3O}}_{\text{2}}\left(g\right)$