A flask is filled with equal moles of A and B . The half lives of A and B are 100 s and 50 s respectively and are independ of the initial concentration. The time required for the concentration of A to be four times that of B is _______s.
(Given : In 2= 0.693)

A flask contains a mixture of compounds A and B . Both compounds decompose by first - order kinetics . The half - lives for A and B are 300 s and 180 s , respectively . If the concentration of A and B are equal initially , the time required for the concentration of A to be four times that of B (in s ) is : ( Use In 2 : 0.693)

Half life of a first order reaction is 4s and the initial concentration of the reactant is 0.12 M. The concentration of the reactant left after 16 s is

There are two species A & B with half lives 54 & 18 minutes resp. The time after which concentration of A is 16 times that of B will be

The half-lives for two samples are 0.1 and 0.8 s whose concentrations are 400 and 50 mol L^(-1) respectively. The order of the reaction is

The half life for a zero order reaction having 0.02M initial concentration of reactant is 100s. The rate constant (in molL^(-1)S^(-1) ) for the reaction is