Answer:
More products (Fe2O3 and SO2) will be produced
Step-by-step explanation:
In the reaction:
4 FeS2(s) + 11 O2(g) ⇌ 2 Fe2O3(s) + 8 SO2(g)
FeS2 is a reactant. When a reactant is added to a reaction which has already reached the equilibrium, more product is produced, so that the equilibrium is reestablished again