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If an equation is given and said to find oxidizing or reducing. On what basis should we find.

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The various definitions of oxidation and reduction (redox) in terms of the transfer of oxygen, hydrogen, and electrons.

Oxidation and Reduction with respect to Oxygen Transfer

  •   Oxidation is the gain of oxygen.
  •   Reduction is the loss of oxygen.

                              

 

Oxidation and Reduction with respect to Hydrogen Transfer

  • Oxidation is the loss of hydrogen.
  • Reduction is the gain of hydrogen.

Notice that these are exactly the opposite of the oxygen definitions 

                                 

                                

 

Oxidation and Reduction with respect to Electron Transfer

  • Oxidation is loss of electrons
  • Reduction is gain of electrons

 

 

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