Final answer:
If a catalyst is added to the reaction CO + H2O → CO2 + H2, the equilibrium will shift towards the products.
Step-by-step explanation:
If a catalyst is added to the reaction CO + H2O → CO2 + H2, the equilibrium will shift towards the products. A catalyst increases the rate of the forward and reverse reactions equally, but it does not affect the position of equilibrium. As a result, the concentration of CO2 and H2 will increase, while the concentration of CO and H2O will decrease.