1.

The rate constant of a reaction is 0.69 xx 10^(-1) "min"^(-1) and the initial concentration is0.2 mol l^(-1) . The half - life period is

Answer»

400 sec
600 sec
800 sec
1200 sec

Solution :The unit of RATE constant SHOWS that REACTION is of first order . For first order reaction , half life is independent of initial CONC., of the reactant . THUS ,
`t_(1//2) = (0.693)/(0.69 xx 10^(-1)) = (0.693 xx 60)/(0.69 xx 10^(-1)) = 600` sec.


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