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ChemistryChemical KineticsSecond & nth Order ReactionsHard2 minPYQ_2022

ChemistryHardsingle choice

The half life of a first order reaction is 2000 years. If the concentration after 8000 years is $0.02 M$ , then the initial concentration was :NEET 2022 (Phase 2)

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Answer:

Solution:

Half life period $(t_{1/2}) = 2000$ years $k k \frac{0.693}{2000} ∴ [A]_{o} = \frac{0.693}{2000} = \frac{2.303}{t} lo g \frac{[ A ] _{o}}{[ A ] _{t}} = \frac{2.303}{8000} lo g \frac{[ A ] _{o}}{0.02} = 0.32 M$

Stream:NEETSubject:ChemistryTopic:Chemical KineticsSubtopic:Second & nth Order Reactions

⏱ 2mℹ️ Source: PYQ_2022

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