MHT CET 2025 Chemistry question

A first order reaction is 50% completed in 16 minute. Find the percentage of reactant reacting in 32 minute.

(A)25%
(B)40%
(C)50%
(D)75%Correct

Answer: (D)

Solution

For a first-order reaction, the time for 50% completion is the half-life, so min. Then 32 min equals two half-lives. After each half-life, half of the remaining reactant is consumed: after 16 min, 50% remains; after 32 min,

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Question ID VK-102403