⇛Redox reactions are sometimes classified as complementary and non complementary Redox reactions,particularly in connection with reactions of transition metal ions in solution.
A Redox reaction in which the oxidizing and reducing species change their oxidation states by an equal number is called a complementary Redox reaction.
Example:
Fe (။)+Ce (ⅳ)➝Fe (Ⅲ) + Sn (Ⅳ)
When oxidation states of the reactants change by a different number of units,the reaction is called a non-complementary reaction.
Example:
2Fe (Ⅲ) + Sn (Ⅱ)➡️2Fe (Ⅱ) + Sn (Ⅳ)
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