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  Average rate of reaction does not give the true picture of the reaction rate. Explain.

Answer:

                  Average reaction rate obtained by dividing the change in molar concentration by the time taken for the change does not give the true picture of the reaction rate. Actually, the change in molar concentration at a particular instant of time depends upon the actual concentration at this point of time. As the actual molar concentration of the species keeps on changing with time, so is the change in molar concentration. Therefore, the molar concentration does not change at a uniform rate and average rate of reaction fails to give the true picture of the reaction rate.