The simplest definition of oxidation and reduction or redox reaction is :
Oxidation is a process of the addition of oxygen or removal of hydrogen from a substance.
Reduction is a process of removal of oxygen and the addition of hydrogen to a substance.
Redox Reaction Definition: A chemical reaction in which oxidation and reduction occur simultaneously is called a Redox reaction.
Redox reactions are classified into four categories based on the nature of the reaction.
- Combination reactions,
- Decomposition reactions.-Displacement reactions. and Disproportionation reactions.
Redox Reaction Example:When hydrogen gas is passed over hot copper oxide, copper oxide is reduced to copper, and hydrogen is oxidized to water.