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In the first order reaction , the concen...

In the first order reaction , the concentration of reactant decrease from `800 mol//dm^3` to `50 mol//dm^3` in `2 xx 10^4 sec`. The rate constant for the reaction is

A

`2 xx 10^(-4)`

B

`3.45 xx 10^(-5)`

C

`1.386 xx 10^(-4)`

D

`2 xx 10^(-4)`

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