Q. Which of the following methods is/are suitable for preventing an iron frying pan from rusting?

1. Applying grease
2. Applying paint
3. Applying a coating of zinc

Select the correct option from the codes given below:
Answer: Only 3
Notes: Applying grease or paint is unsuitable for frying pans due to exposure to high heat and repeated washing, which degrade these coatings. Applying a coating of zinc, known as galvanization, provides durable protection, as zinc forms a protective oxide layer that shields iron from corrosion. Thus, only zinc coating is suitable for iron frying pans.