Question

explain any two reactions in which oxidation and reduction takes place . About 100 to 150 words ​

Answer 1

Reduction is the loss of oxygen atom from a molecule or the gaining of one or more electrons. A reduction reaction is seen from the point of view of the molecule being reduced, as when one molecule gets reduced another gets oxidised. The full reaction is known as a Redox reaction. This is a good way of remembering it.

This can be remembered with the term OIL RIG when speaking about electrons.

1. Oxidation Is Loss
2. Reduction Is Gain

In the case of Organic Chemistry it is usually the case of the gaining/loss of Oxygen/Hydrogen

Oxidation is a process where a substance

1. Loses one or more electrons
2. Gains an oxygen atom or Electronegative atoms
3. Loses a hydrogen atom or Electropositive atoms
4. Gains an increase in its oxidation number

The Process of Oxidation

When an atom or compound is oxidized, its properties change. For example, when an iron object undergoes oxidation, it is transformed because it has lost electrons. Unoxidized iron is a strong, structurally sound metal, while oxidized iron is a brittle, reddish powder. The diagram below illustrates what happens to an atom of iron as it is oxidized:

Once iron has been oxidized, it carries a charge. Because it lost three electrons, it now has a positive charge of three. This positive three charge is represented by the number three and a positive sign (3+) written as a superscript to the right of the Iron (Fe) symbol.

Iron is very easily oxidized, which is why it's important to minimize the exposure of iron to oxygen and moisture. Iron will continue to lose electrons to oxygen as long as oxygen is present.

Oxidation-Reduction (Redox) Reactions

Most of the time, oxidation occurs in tandem with a process called reduction. Reduction is the process of gaining one or more electrons. In an oxidation-reduction, or redox, reaction, one atom or compound will steal electrons from another atom or compound.

A classic example of a redox reaction is rusting. When rusting happens, oxygen steals electrons from iron. Oxygen gets reduced while iron gets oxidized. The result is a compound called iron oxide, or rust. Unoxidized, or pure, iron is distinctly different from the oxidized form that occurs in rust.

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