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Chapter 3: Problem 2

Which of the following methods is suitable for preventing an iron frying pan from rusting? (a) Applying grease (b) Applying paint (c) Applying a coating of zinc (d) All of the above.

Short Answer

Expert verified
The correct answer is (d) All of the above.

Step by step solution

01

- Understand Rusting

Rusting is the corrosion of iron when exposed to moisture and oxygen, forming iron oxide. To prevent rusting, we need to create a barrier between the iron and the air or moisture.
02

- Evaluate Applying Grease

Grease can act as a barrier to moisture and oxygen, thus preventing rust. So, applying grease is a suitable method.
03

- Evaluate Applying Paint

Paint forms a protective coating on the surface of the iron pan, blocking moisture and oxygen. Therefore, applying paint is also a suitable method.
04

- Evaluate Applying a Coating of Zinc

Zinc coating, also known as galvanizing, provides a strong protective layer since zinc is more reactive and corrodes instead of the iron. This is an effective method to prevent rust.
05

- Conclusion

As applying grease, applying paint, and applying a coating of zinc are all suitable methods, the correct answer is all of the above.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

rust prevention
Rusting happens when iron reacts with moisture and oxygen in the air, producing iron oxide. This process weakens the metal and makes it brittle over time.
Rust prevention is essential to preserve the integrity and longevity of iron and steel objects.
Here are some common rust prevention methods:
  • Creating a barrier to block moisture and oxygen from reaching the iron.
  • Using rust-resistant materials like stainless steel.
  • Regular maintenance and cleaning to remove any early signs of rust.
These techniques ensure that iron objects, such as frying pans, are protected from rust damage.
coating methods
Coating methods play a vital role in rust prevention. By applying a protective layer, the iron or steel is shielded from moisture and oxygen.

Let's explore different coating methods:
  • Paint: Painting the surface creates a barrier that prevents contact with air and water. It's a simple and widely used method.
  • Grease: Greasing is effective, especially for moving parts. It not only lubricates but also seals out air and moisture.
  • Zinc Coating (Galvanizing): This method involves applying a layer of zinc to iron or steel. Zinc is more reactive and will corrode first, protecting the iron underneath.
All these methods can be used individually or combined to provide multiple layers of protection, increasing the object's resistance to rust.
oxidation
Oxidation is a chemical reaction where a material loses electrons to oxygen.

In the context of iron, this means:
  • When iron comes into contact with oxygen and water, it undergoes oxidation.
  • This process forms iron oxide, commonly known as rust.
Rust not only looks unappealing but also compromises the strength and functionality of the iron.
Preventing oxidation helps keep iron objects in good condition. Using coatings, as mentioned earlier, is a practical way to prevent oxygen and moisture from initiating the oxidation process. Maintaining a proper coating can significantly slow down or stop the formation of rust, preserving the metal's quality.

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Most popular questions from this chapter

\text { What are amphoteric oxides? Give two examples of amphoteric oxides. }

A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?

You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.

What type of oxides are formed when non-metals combine with oxygen?

Food cans are coated with tin and not with zinc because (a) zinc is costlier than tin. (b) zinc has a higher melting point than tin. (c) zinc is more reactive than tin. (d) zinc is less reactive than tin.
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