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MHT CET Chemistry question

ChemistryChemical KineticsMHT CET

Half-life period of a first order reaction is 10 min. Starting with initial concentration 12M, the rate after 20 min is

Answer: (C)

Solution

and after 20 min (two half-lives) M, so rate $=k[A]=0.0693×3\

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Question ID VK-069191