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प्रश्न
Consult the table of standard electrode potentials and suggest three substances that can oxidise ferrous ions under suitable conditions.
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उत्तर
Oxidation of ferrous ions means:
\[\ce{Fe^{2+} -> Fe^{3+} + e^-}\]
\[\ce{E^\circ_{{Fe^{3+}/Fe^{2+}}}}\] = 0.77 V
If the things that can change Fe2+ to Fe3+ are stronger oxidising agents and have positive reduction potentials higher than 0.77 V, then the cell reaction’s EMF is positive. This applies to elements in the electrochemical series that are below Fe3+/Fe2+, such as Br2, Cl2 and F2.
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