Oxidation and reduction reactions

1. CBSE - 10 Chemical Reactions and Equations
Chemistry Types of Chemical Reactions
Oxidation - Reduction Combustion of gasoline,
burning of wood and
burning of food in our body
are examples of oxidation.
Subtopic ID: 01.03.04

2. CBSE - 10 Chemical Reactions and Equations
Chemistry Types of Chemical Reactions
Oxidation - Reduction An oxidation reaction
occurs as a result of either
the addition of oxygen or
the removal of hydrogen. A
reduction reaction occurs
by either the removal of
Oxidation Reduction oxygen or the addition of
hydrogen.
Addition of oxygen Removal of oxygen
Removal of Addition of hydrogen
hydrogen
Subtopic ID: 01.03.04

3. CBSE - 10 Chemical Reactions and Equations
Chemistry Types of Chemical Reactions
Oxidation - Reduction Oxidation and reduction
occur simultaneously in a
reaction: hence it is called
redox reaction.
Subtopic ID: 01.03.04

4. CBSE - 10 Chemical Reactions and Equations
Chemistry Types of Chemical Reactions
Oxidation - Reduction Zinc oxide undergoes
reduction by losing oxygen to
become zinc, and carbon
undergoes oxidation by
gaining oxygen, to become
carbon monoxide.
Carbon
Zinc oxide
Zinc
Subtopic ID: 01.03.04

5. CBSE - 10 Chemical Reactions and Equations
Chemistry Types of Chemical Reactions
Oxidation - Reduction
Click the view answer button
to find out the product.
Identify oxidation and reduction.
H2S + Cl2  2HCl + S
View answer
Subtopic ID: 01.03.04

6. CBSE - 10 Chemical Reactions and Equations
Chemistry Types of Chemical Reactions
Oxidation - Reduction
Hydrogen sulphide
undergoes oxidation by
the removal of hydrogen.
Chlorine undergoes
reduction by the addition
of hydrogen.
H2S + Cl2  2HCl + S
Subtopic ID: 01.03.04

7. CBSE - 10 Chemical Reactions and Equations
Chemistry Types of Chemical Reactions
Oxidation - Reduction A compound is dissociated
Thermal Dissociation into simple compounds on
heating. Since this
dissociation takes place due
to heating it is called
‘thermal dissociation’.
Thermal = By heating
Dissociation = Splitting into simple compounds
Subtopic ID: 01.03.04

8. CBSE - 10 Chemical Reactions and Equations
Chemistry Types of Chemical Reactions
Oxidation - Reduction Hydrogen peroxide dissociates
Thermal Dissociation on heating, to give water and
oxygen, in the presence of
In the presence of MnO2 manganese oxide.
Heat
2H2O2 2H2O + O2
MnO2
Hydrogen Water Oxygen
peroxide
Subtopic ID: 01.03.04

9. CBSE - 10 Chemical Reactions and Equations
Chemistry Types of Chemical Reactions
Oxidation - Reduction
Click the view answer button
Thermal Dissociation to find out the product.
What happens when ammonia is
heated in the presence of tungsten as
catalyst?
View answer
Subtopic ID: 01.03.04

10. CBSE - 10 Chemical Reactions and Equations
Chemistry Types of Chemical Reactions
Oxidation - Reduction
Ammonia dissociates into
Thermal Dissociation nitrogen and hydrogen in the
presence of tungsten.
Ammonia dissociates into nitrogen and
hydrogen in the presence of tungsten.
Heat
2NH3 N2 + 3H2
Subtopic ID: 01.03.04

11. CBSE - 10 Chemical Reactions and Equations
Chemistry Types of Chemical Reactions
Oxidation - Reduction
Iron articles shiny when they
Corrosion are new, but they loose their
lustre on exposure to air and
moisture. This process is
called rusting. Corrosion
causes damage to iron
structures. We loose
enormous amount of money
by replacing damages of iron
structures.
Subtopic ID: 01.03.04

12. CBSE - 10 Chemical Reactions and Equations
Chemistry Types of Chemical Reactions
Oxidation - Reduction
Fats and oils are also
Rancidity oxidised and get foul smell
and taste change. This
phenomenon is called
rancidity. We can prevent
rancidity by adding
antioxidants or keeping the
food in air tight containers.
Expired
Subtopic ID: 01.03.04