This video lecture from Reaction Kinetics (F.Sc. first year Chemistry) covers the order of a reaction. Individual reactants affect the rate of reaction with respect to certain order or exponent while the sum of the exponents of concentrations of reactants in the rate equation gives the order of complete reaction. The concept of rate determining step and its association with rate law is discussed. 0th, 1st, 2nd, 3rd, fractional and negative order reactions are discussed with examples. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.