JEE Main 2023 · Chemistry · d- and f-Block Elements and Metallurgy · medium

In acidic medium, KMnO4 oxidises FeC2O4 to Fe^3+ and CO2. The number of moles of KMnO4 required to oxidise one mole of FeC2O4 is

Single correct option

In acidic medium,

\mathrm{KMnO_4}

oxidises

\mathrm{FeC_2O_4}

\mathrm{Fe^{3+}}

and

\mathrm{CO_2}

. The number of moles of

\mathrm{KMnO_4}

required to oxidise one mole of

\mathrm{FeC_2O_4}

Show answer and solution

Answer: (B) $0.6$

Per mole of

\mathrm{FeC_2O_4}

\mathrm{Fe^{2+}\to Fe^{3+}}

loses

1\ e^-

, and

\mathrm{C_2O_4^{2-}\to2CO_2}

loses

2\ e^-

, total

3

mol

e^-

\mathrm{MnO_4^-\to Mn^{2+}}

gains

5\ e^-

per mole. Moles of

\mathrm{KMnO_4}=3/5=0.6

. Using only the oxalate (2/5 = 0.4) or only iron (0.2) is the common slip.

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