What is Redox reaction ? Give two examples.
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Classically oxidation refers to combination of an element or a substance with oxygen. In the reactions, C_(s) and Mg_(s) are oxidised to their oxides, CO_2_(g) and MgO_(s) respectively. Classically reduction refers to combination of an element or a substance with hydrogen or removal of oxygen from its compound.
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A redox reaction can be defined as a chemical reaction in which electrons are transferred between two reactants participating in it. This transfer of electrons can be identified by observing the changes in the oxidation states of the reacting species.
Example 1: Reaction Between Hydrogen and Fluorine
In the reaction between hydrogen and fluorine, the hydrogen is oxidized whereas the fluorine is reduced. The reaction can be written as follows.
H2 + F2 → 2HF
The oxidation half-reaction is: H2 → 2H+ + 2e–
The reduction half-reaction is: F2 + 2e– → 2F–
The hydrogen and fluorine ions go on to combine in order to form hydrogen fluoride.
Explanation:
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