Ferrous oxalate, FeC2O4, is oxidised by acidified KMnO4 to Fe^3+ and CO2. The n-factor of FeC2O4 is:

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Ferrous oxalate, $FeC X_{2} O X_{4}$ , is oxidised by acidified $KMnO X_{4}$ to $Fe X^{3 +}$ and $CO X_{2}$ . The n-factor of $FeC X_{2} O X_{4}$ is:

Fe:

+ 2 \to + 3

gives 1 electron; the oxalate part gives 2 electrons. Total n-factor

= 1 + 2 = 3