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.
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