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Consult the table of standard electrode potentials given in the test and suggest three substances that can oxidise ferrous ions under suitable conditions?

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Substances like `F_2, Cl_2, Br_2` which have more values of standard-reduction potentials than that of `Fe^3[0.77 ~V]` will be able,to oxidise `Fe^2 *` ions to `Fe^2+` ions.
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Consult the table of standard electrode potential and suggest three substances that can oxidise ferrous ions under suitable conditions.

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