Factors affecting rate of reaction :
(a) Nature of reactants: Rate of reaction depends upon the nature of reactants. Ionic substances react more rapidly than the substances with covalent bond.
(b) Temperature: Rate of a reaction increases with the increase in temperature.
(c) Surface area: Greater the surface area, more will be rate of reaction, e.g., pulverised wood burns faster than log of wood. Marble powder reacts with acid faster than marble chips.
(d) Concentration: Rate of reaction increases with the increase in concentration in general except in zero order reaction. It is because when we increase concentration, total number of collisions increases. Therefore, probability of effective collisions (which leads to formation of product molecule) also increases, so rate of reaction increase
