
Interpretation :
Three ways must be explained to classify
Concept Introduction :
Oxidation-reduction reactions are also known as redox reaction as in these reactions always oxidation and reduction takes place simultaneously.

Answer to Problem 3RQ
Three ways to classify oxidation-reduction reactions are given below.
- Checking the change in oxidation number.
- Checking the electron gain or loss.
- Checking the addition or removal of electropositive and electronegative groups or atoms.
Explanation of Solution
When oxidation number of an element in a species is increased then it is an oxidation process. Similarly when oxidation number is decreased then it is reduction process.
In this reaction C (with oxidation state 0) is oxidized to CO2 (with oxidation state of C as +4). Oxygen (with oxidation state 0) is reduced to CO2 (with oxidation state of O as -2).
In this case Zn is oxidized as electronegative sulfate group is attached with it. Hydrogen is reduced as electronegative group is removed from H2SO4.
In this reaction Zn is oxidized as electrons are lost. Cu2+ is reduced as it gains electrons.
Chapter 8 Solutions
World of Chemistry
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