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Example 1 : 2CuO  +O₂  __________> 2CuO 

In the above reaction copper gains oxygen ,thus oxidation of copper to copper oxide takes place .

Example 2: 2KI  +H₂O₂  __________> 2KOH  +I₂

Potassium iodide loses electropositive radical potassium and therefore oxidised to iodine. This is an oxidation reaction which involves removal of an electropositive element .

Reduction reaction involves removal of oxygen from a compound or addition of hydrogen to a compound .

Example 1 : CuO +H₂  ___________> Cu +H₂O

Here copper oxide loses oxygen ,thus reduction of copper oxide to copper takes place .

Example 2  : 2HgCl₂  +SnCl₂ ________> Hg₂Cl₂ +SnCl₄

Here mercury [II] chloride gains electropositive radical mercury to form 

mercury [I]chloride .This is a reduction reaction which involves addition of eletropositive element .