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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

`2xx10^(4)`

B

`3.45xx10^(5)`

C

`1.386xx10^(-2)`

D

`2xx10^(4)`

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The correct Answer is:
C
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