NCERT Solutions for Class 8 Science Chapter 6
Important NCERT Questions
8th Chapter 6 Combustion and Flame
NCERT Books for Session 2022-2023
CBSE Board and State Bord
Questions No: 12
Can the process of rusting be called combustion? Discuss.
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No, as rusting is a very slow process as compared to combustion and the heat evolve in combustion is much more than rusting. Rusting can take place at room temperature but combustion need an ignition temperature.
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Rusting:
1. Oxidation Process: Rusting involves the slow oxidation of iron or metals due to exposure to moisture and oxygen.
2. Gradual Reaction: It occurs slowly over time, gradually deteriorating the metal’s surface.
3. No Significant Heat/Light Production: Unlike combustion, rusting does not generate significant heat or light during the process.
4. Non-Flammable: Rusting does not lead to flames or burning as seen in combustion reactions.
5. Formation of Iron Oxides: Iron or metal surfaces develop reddish-brown iron oxides (rust) due to this process.
Combustion:
1. Rapid Oxidation: Combustion is a rapid oxidation process involving a substance combining with oxygen, releasing heat and often light.
2. Immediate Reaction: It occurs swiftly, resulting in flames or burning within a short duration.
3. Heat and Light Production: Combustion generates substantial heat and often emits light during the reaction.
4. Flammable: Combustion involves substances igniting and burning due to the exothermic reaction.
5. Formation of Oxides: Combustion leads to the formation of oxides, but it is an instantaneous process compared to rusting.
In summary, rusting involves a slow, non-flammable oxidation process of metals in the presence of moisture and oxygen, whereas combustion is a rapid, exothermic reaction releasing heat and light when a substance reacts with oxygen.