MHT CET 2025 Chemistry question

What is half life of a first order reaction if time required to decrease concentration of reactant form 0.4 M to 0.1 M is hour?

(A) hour
(B) hour
(C) hourCorrect
(D) hour

Answer: (C)

Solution

For a first-order reaction, the half-life is constant, and in each half-life the concentration halves. Going from 0.4 M to 0.1 M: , which takes two half-lives. Hence hour, so

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Question ID VK-103301