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In a first order reaction the concentrat...

In a first order reaction the concentration of reactant decreases from 800 mol/dm to `50mol//dm^(3)` in `2xx10^(2)s`. The rate constant of reaction in `s^(-1)` is

A

`2 xx 10^(-4) s^(-1)`

B

`1.386 xx 10^(-2) s^(-1)`

C

`3.45 xx 10^(5) s^(-1)`

D

`2 xx 10^(4) s^(-1)`

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