0.31 g of an alloy of Fe + Cu was dissolved in excess dilute and the solution was…

CHEMISTRY · Subjective · A Level · Chemistry · Oxidation, reduction and redox reactions · Oxidation, reduction and redox reactions

Problem

0.31 g of an alloy of Fe + Cu was dissolved in excess dilute

\text{H}_2\text{SO}_4

and the solution was made upto

100 \text{ mL}

20 \text{ mL}

of this solution required

3 \text{ mL}

\frac{N}{30} \text{ K}_2\text{Cr}_2\text{O}_7

solution for exact oxidation. The % purity (in closest value) of Fe in wire is :