MCQ
According to the law of mass action, the rate of a chemical reaction is proportional to the product of:
Unit-9 Chemical Equilibrium
A the masses of the reacting substances
B the active masses (molar concentrations) of the reactants
C the temperatures of the reactants
D the volumes of the products
Explanation

The law of mass action states that the rate of reaction is proportional to the product of the molar concentrations (active masses) of the reactants.