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Theory:

Oxidising agents:
Substances that can oxidise other substances are called Oxidising agents. These are also called electron acceptors because they remove electrons from other substances.
Example:
\(H_2O_2\), \(MnO_4\), \(CrO_3\), \(Cr_2O_7{^2}{^-}\)
Reducing agents:
Substances that can reduce other substances are called Reducing agents. These are also called electron donors because they donate electrons from other substances.
Example:
\(NaBH_4\), \(LiAlH_4\), Palladium, Platinum.
Oxidation reactions in daily life:
 
In nature, the oxygen existing in atmospheric air oxidises several things, starting from metals to living tissues.
Example:
1. The shining outside of metals tarnishes due to the creation of respective metal oxides on their surfaces. This is called Corrosion.
 
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Corrosion on kitchen utensils
 
2. The freshly sliced surfaces of vegetables and fruits turn brown after some time because of compounds' oxidation.
 
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Oxidation on apple
  
3. The oxidation reaction in food products left open for an extended period is responsible for food spoiling. This is termed Rancidity.
 
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Oxidation or Rancidity on the cake