Chemistry X- OXIDATION AND REDUCTION Ch.Chemical and chemical Equations

OXIDATION AND REDUCTION Ch. Chemical and chemical Equations

In our daily life we come across phenomena like fading of the colours of the clothes, burning of combustible substances like cooking gas, wood and coal, and also rusting of iron articles.

All such processes fall in the category of a specific type of chemical reaction called oxidation – reduction reaction (redox reaction).

Oxidation: A chemical reaction which involves addition of oxygen or removal of hydrogen or loss of electron(s) is called as oxidation.

2Mg + O2 →2MgO (addition of oxygen)

H2S + Br2 → 2HBr + S (removal of hydrogen)

Fe2+ → Fe3+ + e- (loss of electron)

Reduction: A chemical reaction which involves addition of hydrogen or removal of oxygen or gain of electron(s) is called as reduction.

2Na + H2 → 2NaH (addition of hydrogen)

CuO + H2 → Cu + H2O(removal of oxygen)

Fe3+ + e- → Fe2+ (gain of electron)

Redox reaction: A chemical reaction in which oxidation and reduction take place simultaneously is called redox reaction.

Zn + CuSO4 → Cu + ZnSO4

ZnO + C → Zn +CO

MnO2 + HCl → MnCl2 + H2 O + Cl2

More post describing redox reaction

The Effects of Oxidation Reactions : Many metals are chemically active elements and get easily affected by substances like moisture, air, acids, etc. Example-Iron articles that are shiny when new, but get coated with a reddish brown powder when left for some time. This process is commonly known as rusting of iron. Rusting eventually causes structural weakness and disintegration of the metal.

When a metal is attacked by substances around it, it is said to corrode and this process is called corrosion. Corrosion causes deterioration of essential properties in a material..............Read more

In our daily life we come across phenomena like fading of the colours of the clothes, burning of combustible substances like cooking gas, wood and coal, .................................... Read more  

science class 10 oxidation, reduction and redox chemical reaction

Chemistry x - OXIDATION AND REDUCTION : Oxidation: A chemical reaction which involves addition of oxygen or removal of hydrogen or loss of electron(s) is called as oxidation.
2Mg + O2 →2MgO (addition of oxygen)
H2S + Br2 → 2HBr + S (removal of hydrogen)
Fe2+ → Fe3+ + e- (loss of electron)           ..........................................................,,,,,,,,,Read more