Question

define redox reaction??​

Answer 1

Answer:

Redox is a type of chemical reaction in which the oxidation states of atoms are changed. Redox reactions are characterized by the actual or formal transfer of electrons between chemical species, most often with one species undergoing oxidation while another species undergoes reduction.

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Answer 2

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Redox Reactions:

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.

Types of Redox Reactions

The different types of redox reactions are:

• Decomposition Reaction
• Combination Reaction
• Displacement Reaction
• Disproportionation Reactions
• Decomposition Reaction

This kind of reaction involves the breakdown of a compound into different compounds. Examples of these types of reactions are:

2NaH → 2Na + H2

2H2O → 2H2 + O2

Na2CO3 → Na2O + CO2

All the above reactions result in the breakdown of smaller chemical compounds in the form of AB → A + B

But, there is a special case that confirms that all the decomposition reactions are not redox reactions.

For example CaCO3 → CaO + CO2

Combination Reaction

These reactions are the opposite of decomposition reaction and hence involve the combination of two compounds to form a single compound in the form of A + B → AB. For example:

H2 + Cl2 → 2HClC+O2→CO2

4Fe+ 3O2→2Fe2O3

Displacement Reaction

In this kind of reaction, an atom or an ion in a compound is replaced by an atom or an ion of another element. It can be represented in the form of X + YZ → XZ + Y. Further displacement reaction can be categorized into

Metal displacement Reaction

Non-metal displacement Reaction

Metal Displacement

In this type of reaction, a metal present in the compound is displaced by another metal. These types of reactions find their application in metallurgical processes where pure metals are obtained from their ores.

For example CuSO4+Zn→Cu+ZnSO4

Non-Metal Displacement

In this type of reaction, we can find a hydrogen displacement and sometimes rarely occurring reactions involving oxygen displacement.

Disproportionation Reactions

The reactions in which a single reactant is oxidized and reduced is known as Disproportionation reactions.

For example: P4 + 3NaOH + 3H2O → 3NaH2PO2 + PH3