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Consult the table of standard electrode ...

Consult the table of standard electrode potential and suggest three substances that can oxidize `Fe^(2+)` ions under suitable conditions.

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The oxidation of `Fe^(2+)` ions proceeds as follows :
`Fe^(2+)toFe^(3+)+e^(-) ,E_(OX)^(@)=-0.77 V`
Only those substance can oxidise `Fe^(2+)` ions to `Fe^(3+)` ions which can accept electrons released during oxidation or are placed above iron in electrochemical series. These are : `Cl_(2)(g),Br_(2)(g) " and " Cr_(2)O_(7)^(2-) "ions " ("in the acidic medium")`.
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