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NCERT Class XII Chemistry
Chapter - Electrochemistry
Questions with Solutions

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Question : 21
Total: 32
Consult the table of standard electrode potentials and suggest three substances that can oxidise ferrous ions under suitable conditions.
Solution:  
Oxidation of ferrous ions means:
Fe2+ –––––––▶Fe3++e–;
E°Fe3+∕Fe2+=0.77V
Only those substances can oxidise Fe‌2+ to Fe which are stronger oxidising‌3+agents and have positive reduction potentials greater than 0.77 V sothat EMF of the cell reaction is positive. This is for elements lying belowFe‌3+/Fe‌2+ in the electrochemical series, for example, Br‌2, Cl‌2 and F‌2.
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