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JEE Main Chemistry question

ChemistryChemical KineticsJEE Main

In a 1st order reaction the concentration of reactant decreases from 800 mol/dm³ to 50 mol/dm³ in . The rate constant of reaction in is

Answer: (C)

Solution

, so the change corresponds to 4 half-lives occurring in , giving

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Question ID VK-144430