Equilibrium.... shift of equilibrium

Question

Oxygen can be converted to ozone (O​3)​ in the following reaction:

3 O​2(​ g) + heat ⇌ 2 O​3​(g)

All of the following changes at equilibrium will shift the reaction to products except:

A. adding O​2​ (g) B. adding O​3​ (g)

C. raising the temperature D. decreasing the volume of the container

Answer 1

3 O​2(​ g) + heat ⇌ 2 O​3​(g)

According to Le Chatelier, ...

Adding O2 will shift reaction to products

Adding O3 will shift the reaction to reactants

Raising the temperature will shift the reaction to products because heat is a reactant (endothermic)

Decreasing the volume will increase the pressure which will shift the reaction to products