CBSE Class 11-science Chemistry Redox Reactions
Redox Reactions
Oxidation is loss of electrons and reduction is gain of electrons.
Oxidation and reduction always occur simultaneously, thus the name REDOX reaction.
Elements which lose electrons are reducing agents and those which gain electrons are oxidising agents.Oxidation Number
Oxidation number is the oxidation state of an element ascertained according to a set of rules. These rules are formulated on the basis that the electron in a covalent bond belongs entirely to the more electronegative element.
Oxidation is the increase in oxidation number and reduction is the decrease in oxidation number of an element in the given substance.Balancing Redox Reactions
Oxidation number changes in a redox reaction.
To balance a redox the mass and charge both are balanced. The principle used in balancing redox reaction is that number of electrons lost is same as number of electrons gained.
Redox reactions are balanced by oxidation number and Half-reaction method.Electrode Potential
Systems that have both oxidized and reduced form together in a half cell reaction are known as redox couple.
Difference in electrode potential of two electrodes in a cell is electromotive force, or EMF or cell voltage.
