WAEC - Chemistry (2000 - No. 21)
Chemical equilibrium is attained when
reactants in the system are used up
concentrations of the products are greater than those of the reactants
concentrations of the reactants and products remain constant
reactants stop forming the products
Giải thích
Chemical equilibrium is attained whenever the concentration of reactants on the Left hand side and the concentration of the products on the left hand side remain unchanged or constant. Which means the effect of the changes brought on the system in equilibrium has been cancelled according to Le Chatelier's principle. The correct answer is option C