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Normality

1 mole of C...

Question

$1$ mole of ${C r}_{2} O_{7}^{2 -}$ oxidises _______ moles of $F e C_{2} O_{4}$ in acidic medium.

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Solution

$1$ mole of ${C r}_{2} O_{7}^{2 -}$ oxidises $2$ moles of $F e C_{2} O_{4}$ in acidic medium.
The explanation is given below:
$1$ mole of dichromate ion gives $6$ moles of electrons.
$C r_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-} \to 2 C r^{3 +} + 7 H_{2} O$
$1$ mole of ferrous ions requires $1$ mole of electrons for oxidation.
$F e^{2 +} \to F e^{3 +} + e^{-}$
$1$ mole of oxaltate ion requires $2$ moles of electrons for oxidation.
$C_{2} O_{4}^{2 -} \to 2 C O_{2} + 2 e^{-}$
Thus, $1$ mole of ferrous oxalate requires $3$ electrons for oxidation.
Hence, $1$ mole of dichromate ion will oxidize $2$ moles of ferrous oxalate.

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