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JEE Main Chemistry question

ChemistryChemical KineticsJEE Main

Two substances and are present such that and half-life of is 5 minute and of is 15 minute. If they start decaying at the same time following first order, how much time later will the concentration of both of them be same?

Answer: (A)

Solution

Let , . After 15 min, has gone through 3 half-lives: ;

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Question ID VK-144580