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A mixture containing 0.05 mol of K(2)Cr(...

A mixture containing 0.05 mol of `K_(2)Cr_(2)O_(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_(2)SO_(3)` solution of titration. Concentration of `Na_(2)S_(2)O_(3)` solution was

A

`0.4 molL^(-1)`

B

`0.20 molL^(-1)`

C

`0.25 molL^(-1)`

D

`0.30 molL^(-1)`

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The correct Answer is:
A
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