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For the reaction Cl(2) + 2I^(-) to I(2) ...

For the reaction `Cl_(2) + 2I^(-) to I_(2) + 2Cl^(-)`, the initial concentration of `I^(-)` was `0.4 "mol" ^(-1)` and concentration after 20 minutes was 0.28 mol `L^(-1)`. The rate of formation of `I_(2)` in mol `L^(-1)` would be

A

`2 xx 10^(-3)`

B

`3 xx 10^(-3)`

C

`3.4 xx 10^(-4)`

D

`2.8 xx 10^(-2)`

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