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Q 1169356215.     `0.01` mole of `Fe_3O4` is treated with excess of `KI` solution in presence of dilute `H_2SO_4` whereby iron is reduced to `Fe^(2+)`along with liberation of iodine. What volume of `0.1` `M` `Na_2S_2O_3` will be needed to reduce the liberated iodine?
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