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In a first order reaction, the concentra...

In a first order reaction, the concentration of reactant decreases from 0.8 mol/`dm^(3)` to 0.05 mol/`dm^(3)` in `2 xx 10^(4)` sec. The rate constant in `sec^(-1)` is:

A

`2 xx 10^(4)`

B

`3.45 xx 10^(-5)`

C

`1.386 xx 10^(-4)`

D

`2 xx 10^(-4)`

Text Solution

Verified by Experts

`K = (2.303)/(t)log""(C_(0))/(C) = (2.303)/(2 xx 10^(4))log""(0.8)/(0.05) = 1.386 xx 10^(-4) sec^(-1)`
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