Corrosion Prevention MCQs Quiz | Class 10
Class: X, Subject: Science (Code 086), Unit: Unit I: Chemical Substances – Nature and Behaviour. This quiz covers the topic of Corrosion Prevention, including painting, galvanizing, alloying, and other basic methods. Attempt the questions, submit to check your score, and download the solution PDF.
Overview: Corrosion Prevention
Corrosion is a natural process where refined metals are converted into more stable forms such as oxides, hydroxides, or sulfides. For iron, this process is specifically called rusting. Preventing corrosion is essential to save resources and money.
Key Methods of Prevention
- Barrier Protection: Preventing the metal surface from coming into contact with moisture and oxygen. This is done by painting, oiling, greasing, or varnishing.
- Galvanization: A method of protecting steel and iron from rusting by coating them with a thin layer of Zinc. Even if the zinc coating is scratched, it protects the iron because zinc is more reactive than iron and oxidizes first (sacrificial protection).
- Alloying: Improving the properties of a metal by mixing it with other metals or non-metals. For example, Stainless Steel is hard and rust-proof.
- Anodizing: Forming a thick oxide layer on aluminum to protect it from further corrosion.
- Tinning and Chrome Plating: Coating with tin or chromium provides a shiny appearance and prevents corrosion.
Important Alloys (Class 10 Syllabus)
An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal.
| Alloy | Composition | Properties/Use |
|---|---|---|
| Stainless Steel | Iron + Nickel + Chromium | Hard, does not rust. Used in utensils, surgical instruments. |
| Brass | Copper + Zinc | Malleable, strong. Used in decorative items, musical instruments. |
| Bronze | Copper + Tin | Hard, resistant to corrosion. Used for statues, medals. |
| Solder | Lead + Tin | Low melting point. Used for welding electrical wires together. |
| Amalgam | Mercury + Any other metal | Dental fillings (Silver amalgam). |
Quick Revision Points
- Pure iron is very soft and stretches easily when hot. Mixing it with a small amount of carbon (0.05 percent) makes it hard and strong.
- Pure gold (24 carat) is too soft for jewelry. It is alloyed with silver or copper to make it hard (22 carat gold is used for ornaments).
- Rusting of iron requires both air (oxygen) and water (moisture).
Extra Practice Questions
- Why is zinc used for galvanization instead of copper?
- What happens to the electrical conductivity of a metal when it forms an alloy?
- Name the constituents of the alloy used for joining electrical wires.
- Why do we apply oil on iron tools kept in storage?
- State the reason why aluminum does not corrode easily despite being reactive.
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