Q 4 and 5. With proper explanation
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Answer:
4) Sea is considered as an mode of travel in water. They are mostly used in seas and oceans. these water bodies contains salts, which may rust the iron surfaces or metal parts of the ship. therefore , it may be unsafe on the ship.
hence, iron parts of ship need to be replaced every year
Explanation:
Answer:
4. it is iron so therefore it rusts
Explanation:
4. Rusting is the corrosion of iron. it is proven that it's only iron that rusts. Rusting occurs only in the presence of moisture/ water and air. the iron on the ship is exposed to all these conditions. therefore it rusts.
this is why it has to be changed periodically
5.Oxide layers on metal surfaces are also important in electrochemistry. Thin films on non-noble metals make the latter chemically inert. Aluminum is a good example. The oxide film that is formed by anodic oxidation in oxalic acid protects the metal and prevents corrosion. The technical process is called Eloxal process. These oxide films typically have a porous structure with a hexagonal pore arrangement. The pores can be used for coloring the metal surface and as templates for forming nanostructures. A high order can be achieved.