In a first order reaction, the concentra...

In a first order reaction, the concentration of the reactant decreases form `800 "mol dm"^(-3)` to `50 "mol dm"^(-3)` in `2 xx 10^(4) s`. The rate constant of the reaction (in `s^(-1)`) is

`3.45xx10^(-5)`

`1.38xx10^(-4)`

`1.00xx10^(-4)`

`5.00xx10^(-5)`

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