Consider the following reaction
A+B→C
The time taken for A to become $1 / 4^{\text {th }}$ of its initial concentration is twice the time taken to become 1/2 of the same. Also, when the change of concentration of B is plotted against time, the resulting graph gives a straight line with a negative slope and a positive intercept on the concentration axis.
The overall order of the reaction is
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Solution
For $1^{\text {st }}$ order reaction
75% life =2×50% life
So order with respect to A will be first order.
So order with respect to B will be zero.
Overall order of reaction =1+0=1
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So order with respect to B will be zero.
Overall order of reaction =1+0=1
