REDOX REACTIONS
Chemical reactions involve transfer of electrons from one chemical substance to another. These electrons transfer reactions are termed as THE oxidation-reduction or redox-reactions.
Molecular and Ionic equations
(1) Molecular equations : When reactants and the products involved in the chemical change are written in the molecular forms in chemical equation, it is termed as molecular equation.
Example : 
In the above example the reactants and the products have been written in the molecular forms, thus the equation is called as molecular equation.
(2) Ionic equations : When the reactants and products involved in a chemical change are ionic compounds, these will be present in form of the ions in solution. The chemical change is written in the ionic forms in chemical equation, it is called as ionic equation. The example is given as follows,
In the above example the reactants and the products have been written in the ionic forms, thus equation is called as ionic equation.
(3) Spectator ions: In the ionic equations, ions which do not undergo any kind of change and equal in number in both reactants and products are termed as spectator ions and are not included in the final balanced equations. The example is given as follows,,
In the above example, the Cl- ions are the spectator ions and thus are not included in final ionic balanced equation.
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