T(50) of first order reaction is 10 min....

`T_(50)` of first order reaction is 10 min. starting with 10 `"mol"^(-1)` rate after 20 min is :

A

`0.0693 mol L^(-1) min^(-1)`

B

`0.0693xx2.5 mol L^(-1) min^(-1)`

C

`0.0693xx5 mol L^(-2) min^(-1)`

D

`0.0693xx10 mol L^(-1) min^(-1)`

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The correct Answer is:

B

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