JEE Main · 2024 · 31 Jan 2024 · Shift 2 · Chemical Kinetics

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r = k[A] for a reaction, 50% of A is decomposed in 120 minutes. The time taken for 90% decomposition of A is _____ minutes.

Answer: 399

Solution

Since , the reaction is first order, so min.

For 90% decomposition (10% of A remaining), the first-order integrated rate law gives


Equating the two expressions for :


minutes.

JEE Main · 2024 · 31 Jan 2024 · Shift 2 · Integer answer

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