Which factors affect the rate of a chemical reaction?
(A) Temperature
(B) Pressure
(C) Product concentration.
(D) Reactant Concentration
(E) Shape of container
(F) Catalyst
Choose the correct answer from the option given below
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A), (B), (D) and (F) only
The rate of a reaction is the change in concentration of a reactant or product per unit time. It depends on the experimental conditions: the concentration of reactants (pressure in the case of gases), the temperature and a catalyst. Anything that changes how often or how energetically the reactant molecules collide changes the rate.
(A) Temperature — Correct. Higher temperature increases the fraction of molecules with energy above the activation energy.
(B) Pressure — Correct. For reactions of gases, higher pressure increases the concentration of the reactants.
(C) Product concentration. — Incorrect. The rate law contains the concentrations of the reactants, not of the products.
(D) Reactant Concentration — Correct. Rate = k[A]x[B]y, so the rate changes with reactant concentration.
(E) Shape of container — Incorrect. The shape of the vessel does not change the concentration, temperature or activation energy.
(F) Catalyst — Correct. A catalyst lowers the activation energy, so more collisions are effective.
NCERT (2026-27 edition):
Factors Influencing Rate of a Reaction
