When FeCl3 reacts with K3[Fe(CN)6] no blue colour is observed. K3[Fe(CN)6] is used as indicator in estimation of Fe2+ by Cr2O7 2' ion in acidic medium. End point will be when

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When FeCl3 reacts with K3[Fe(CN)6] no blue colour is observed. K3[Fe(CN)6] is used as indicator in estimation of Fe2+ by Cr2O7 2' ion in acidic medium. End point will be when