CHEM BRAIN

For the first order reaction, half life is related to the expression t_1/2 = 0.693/k Half life is the SET2019

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

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

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]

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]

The half-life of a first order reaction having rate constant K = 1.7x 10^-5s^-1
is [BHU 2005]

Half life period of a first order reaction is 1386s. The specific rate constant of the reaction is  2009NEET

The rate of first order reaction is 0.04molL^-1s^-1 at 10sec and 0.03 molL^-1s^-1 at 20sec after initiation of the reaction. The half life of this reaction is  NEET-1 2016