When those iron article is put in high tem. of sunlight, then there is a chance of break ing of plastic.

Incorrect Method of Preventing Rusting

The incorrect method of preventing rusting is option A - "Iron articles should be covered with plastic."

Explanation:

Rusting is a chemical process that occurs when iron or steel comes in contact with moisture and oxygen. It leads to the formation of iron oxide, which is commonly known as rust. To prevent rusting, various methods can be employed, but covering iron articles with plastic is not one of them.

Reasons why covering iron articles with plastic is not effective:

1. Lack of air circulation: Plastic covering prevents air circulation around the iron surface. Oxygen is necessary for rusting to occur, and by blocking the air, it creates a conducive environment for moisture accumulation, which promotes rust formation.

2. Moisture trapping: Plastic covering can trap moisture against the iron surface, especially if there is any condensation or humidity in the environment. Moisture is a crucial factor in rust formation, and by keeping the iron in contact with trapped moisture, the chances of rusting increase.

3. Build-up of acids: Plastic coverings can also cause the accumulation of acids on the iron surface, especially if there are any chemicals or pollutants present in the environment. Acids can accelerate the rusting process by corroding the protective layer on the iron.

Effective methods of preventing rusting:

1. Galvanization: Galvanised iron articles are coated with a layer of zinc, which acts as a protective barrier. Zinc is more reactive than iron, so it corrodes first, sacrificing itself to protect the iron underneath. This method is commonly used for water supply pipes.

2. Painting: Applying a coat of paint on iron surfaces creates a physical barrier between the metal and the surrounding environment. The paint acts as a protective layer, preventing moisture and oxygen from coming into direct contact with the iron surface.

3. Oiling or greasing: Machine parts can be protected from rusting by applying a thin layer of oil or grease. This layer acts as a barrier, preventing moisture and oxygen from reaching the iron surface.

In conclusion, covering iron articles with plastic is not an effective method of preventing rusting. Instead, methods such as galvanization, painting, and oiling/greasing are more suitable for protecting iron surfaces from rust formation.