A standard solution of K(2)Cr(2)O(7) (mo...

A standard solution of `K_(2)Cr_(2)O_(7)` (mol. Mass 294) contains 2.94 g dissolved to make 250 ml solution 20 ml of this solution with excess of 5% Kl solution liberate iodine which when titrated with `Na_(2)S_(2)O_(3)` solutioin using starch indicator changes blue colour to colourless just at the addition of 18 ml `Na_(2)S_(2)O_(3)` solution. The average oxidation number of sulphur in the product of titration and the molarity of `Na_(2)S_(2)O_(3)` are

A

`(+5)/2,0.04M`

B

`(+5)/2,0.27M`

C

`+2,0.54M`

D

`+6,0.54M`

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