Consult the table of standard electrode potentials and suggest three substances that can oxidize ferrous ions under suitable conditions.

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Solution

Oxidation of ferrous ions

In electrochemical series on going top to bottom the ease of oxidation decreases.
In this series, the substance is at the top, is more reactive, and gets oxidized easily than the substance that is at the bottom of the series.

This means the substance which is having high reduction potential than ferrou ions can easily oxidize ferrous ions to ferric ions.

The elements like $C l_{2}, B r_{2} and A u$ of the table can oxidize ferrous ions.

$E_{F e^{3 +} | F e^{2 +}}^{\circ} = 0.771 V$

$C l_{2} (g) + 2 e^{-} \to 2 C l^{-} (a q) : E^{\circ} = 1.36$
$B r_{2} (g) + 2 e^{-} \to 2 B r^{-} (a q) : E^{\circ} = 1.09$
$A u_{3 +} (g) + 3 e^{-} \to A u (s) : E^{\circ} = 1.40$

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