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Complementary and Non-Complementary Reactions

All the electron transfer reaction discussed previously are described as complementary.

Most Non-complementary reactions proceed via elementary steps each involving one electron transfers. The most commonly observed kinetic scheme is;

For example in chromate ion oxidations (HCr(VI)O4-)

Cr(VI) + Red Cr(V) + Ox

Cr(V) + Red Cr(IV) + Ox

Cr(IV) + Red Cr(III) + Ox

Applying steady-state approximation to Cr(V) then the following rate law can be derived