Q 1139634512.     A mixture containing `0.05` mol of `K_2Cr_2O_7 `and `0.02` mol of `KMnO_4` was treated with excess of `KI` in acidic medium. The liberated iodine required `2.0` L of `Na_2S_2O_3` solution for titration. Concentration of `Na_2S_2O_3` solution was


A

`0.1` mol `L^(–1)`

B

`0.2` mol `L^(–1)`

C

`0.15` mol `L^(–1)`

D

`0.4` mol `L^(–1)`

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