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0.2828 g of iron wire was dissolved in e...

0.2828 g of iron wire was dissolved in excess dilute `H_(2)SO_(4)` and the solution was made upto 100mL. 20mL of this solution required 30mL of `N/(30)K_(2)Cr_(2)O_(7)` solution for exact oxidation. Calculate percent purity of Fe in wire.

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