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MHT CET 2025 Chemistry question

ChemistryChemical KineticsMHT CET 2025

In a first order reaction concentration of reactant decreases from 20 milli mol dm to 8 milli mol dm in 40 minute, find rate constant of reaction?

Answer: (B)

Solution

For a first order reaction . Substituting,

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Question ID VK-100716