Redox reactions, or oxidation-reduction reactions, primarily involve the transfer of electrons between two chemical species. The compound that loses an electron is said to be oxidized, the one that gains an electron is said to be reduced. There are also specific terms that describe the specific chemical species. A compound that is oxidized is referred to as a reducing agent, while a compound that is reduced is referred to as the oxidizing agent.
In this chapter you will be learning how to balance redox reaction by ion electron method and also balancing in acidic and alkaline solutions .In addition to this we will know how to calculate the oxidation numbers .