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form graph, it is evident that <br> a. Concentration of `40` reduced to `20` in `5 min`. <br> b. `20` reduced to `10` in `5 min`. <br> c. `10` reduces to `5` in `5 min`. <br> i.e., half is independent of concentration which is characteristic of first order. In first order, the concentration of the reactant can never be the theoretically zero.