The reduction of peroxydisulphate ion by `I^(-)` ion is expressed by `S_(2)O_(8)^(2-) + 3 I^(-) rarr 2SO_(4)^(2-) + I_(3)^(-)` ,If rate of disappearance of `I^(-)` is `9//2xx10^(-3)` mol `L^(-1) S^(-1)`, what is the rate of formation of `SO_(4)^(2-)` during same time ?

Options

A. `3 xx 10^(-3) "mol Lit"^(-1) s^(-1)`
B. `2 xx 10^(-3) "mol Lit^(-1) s^(-1)`
C. `10^(-3) "mol Lit^(-1) s^(-1)`
D. `4 xx 10^(-3) "mol Lit^(-1) s^(-1)`

Answer

A