A mixture of 1.44 g of FeC2O4 (molar mass 144) and 1.52 g of FeSO4 (molar mass 152) is dissolved in dilute H2SO4 and titrated with 0.0200 M KMnO4, which oxidises Fe^2+ to Fe^3+ and oxalate to CO2. The volume of KMnO4 required is:

JEE Advanced levelSingle correct optionDifficulty 3 of 3eq195

A mixture of $1.44 g$ of $FeC X_{2} O X_{4}$ (molar mass $144$ ) and $1.52 g$ of $FeSO X_{4}$ (molar mass $152$ ) is dissolved in dilute $H X_{2} SO X_{4}$ and titrated with $0.0200 M$ $KMnO X_{4}$ , which oxidises $Fe X^{2 +}$ to $Fe X^{3 +}$ and oxalate to $CO X_{2}$ . The volume of $KMnO X_{4}$ required is:

Moles:

FeC X_{2} O X_{4}

= 10.0

mmol (n = 3, so 30.0 meq) and

FeSO X_{4}

= 10.0

mmol (n = 1, so 10.0 meq); total

40.0

meq. Normality of

KMnO X_{4}

= 5 \times 0.0200 = 0.100 N

. Volume

= 40.0/0.100 = 400 mL