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Half life of reaction

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Question#1

For the first order reaction, half life is related to the expression t1/2 = 0.693/k Half life is the SET2019

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Question#2

The half life of N2O5 at 45oC is 24minutes. How long will it take for sample of N2O5.  to decay to 25% of its original concentration?  MDCAT2015

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Question#3

The rate constant ''k'' is 0.0693min-1. The half life for the 1st order reaction will be MDCAT2016

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Question#4

For a first order reaction A → B the reaction rate at reactant concentration of
0.01M is found to be 2.0x10-5 mol L-1 s-1.The half life period of the reaction is [CBSE PMT 2005]

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Question#5

If a substance with half life 3 days is taken at other place in 12 days.
What amount of substance is left now [AFMC 2005]

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