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Types of Redox Reactions

A sample of F...

Question

A sample of $F e S O_{4}$ and $F e C_{2} O_{4}$ is dissolved in $H_{2} S O_{4}$ . The complete oxidation of sample required 8/3 eqv. of $K M n O_{4}$ . After oxidation, the reaction mixture was reduced by $Z n$ . On further oxidation by $K M n O_{4}$ 5/3 eqv were used. The moles of $F e C_{2} O_{4}$ in the mixture is

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Solution

Let, in sample mols of $F e S O_{4}$ and $F e C_{2} O_{4}$ be x and y respectively.
$F e S O_{4} n f = 1 + F e C_{2} O_{4} n f = 3 + K M n O_{4} ⟶ F e^{+ 3} + + 4 C O_{2} + M n^{+ 2}$

So, (no. of eqv. of $F e S O_{4}$ + no. of eqv. of $F e C_{2} O_{4}$ ) = no. of eqv. of $K M n O_{4}$
$x \times 1 + y \times 3 = \frac{8}{3} . . . . . (1)$
$x + y = \frac{5}{3} . . . . . (2)$
Using (1) an (2), we get $x = 7 / 6; y = 1 / 2$

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