🧪 Corrosion

 Certainly, Mayank. Here's a clear, CBSE Class 10–level explanation of Corrosion, suitable for teaching, revision, and exam preparation.

🧪 Corrosion

(Class 10 Science – Chapter 1 : Chemical Reactions and Equations – Section 1.3.1)

📘 Definition:

Corrosion is the gradual destruction of metals due to the chemical reaction with substances in the environment, such as moisture, air, water, and acids.

🔍 Common Examples of Corrosion:

Metal Corroded Form Appearance
Iron Iron oxide (rust) Reddish-brown coating
Copper Basic copper carbonate Green coating
Silver Silver sulphide Black coating (tarnishing)

🧪 Rusting of Iron – A Type of Corrosion:

4Fe+3O2+xH2O→2Fe2O3⋅xH2O4\text{Fe} + 3\text{O}_2 + x\text{H}_2\text{O} \rightarrow 2\text{Fe}_2\text{O}_3 \cdot x\text{H}_2\text{O}

(Rust is hydrated iron(III) oxide)

⚠️ Why is Corrosion Harmful?

  • Weakens metal objects

  • Damages bridges, buildings, pipelines, vehicles

  • Causes huge economic loss every year due to maintenance and replacement

🛡️ Prevention of Corrosion:

Method How it Helps
Painting Forms a protective layer from air and moisture
Oiling/Greasing Blocks air and moisture from reaching the surface
Galvanisation Coating iron with zinc to prevent rusting
Electroplating Using another metal layer to protect the metal
Alloying Example: Stainless steel (iron + chromium) resists rusting

🧠 CBSE Exam Tip:

Q: What is corrosion? Give one example and one method to prevent it.
✅ Answer:
Corrosion is the gradual deterioration of metals due to their reaction with air, water, or other substances.
Example: Rusting of iron.
Prevention: Galvanisation.

Let me know if you'd like a worksheet, animation storyboard, or revision flashcards to use while teaching this topic!

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