ction-A and Reaction-B are first-order reactions. The natural logarithm of co t-

Question

ction-A and Reaction-B are first-order reactions. The natural logarithm of co t-order reactions. The natural logarithm of concentration of reactant s time at the same temperature for both reactions are shown below. Which of the following statements ng about Reaction-A and Reaction-B is true? 2 A) Reaction-A has a greater initial concentration than Reaction-B B) Rea C) Reaction-A has a greater rate constant than Reaction-B D) Reaction-A has a higher order of reaction than Reaction-HB E) None of these ction-A has a longer half-life than Reaction-B

Explanation / Answer

integrated rate law for 1st order reaction:
ln [A] = –kt + ln [A]o

ln [A]o is same for both
So, [A]o is same. So, initial concentration is same for both

slope is more negative for A
slope = -k
so, k is for A

half life = 0.693/K
So, half life is less for A and more for B

Answer: C

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