Question

All chemical reactions reach chemical equilibrium unless
a. there is more product than reactant.
b. there is more reactant than product.
c. a product is removed or escapes.
d. their activation energy increases.

Answer 1

c. Product is removed or escapes.
As product is removed, its concentration is lowered. Your reactants are going to continue reaction to reach the equilibrium concentration of product. A system will continue to be in equilibrium when the concentration of the reactants and products are maintained (as well as temperature).