D And F Block Elements

Answer (d) Chromium forms an oxide layer and protects iron from rusting

corrosion of iron

Many items, like shovels and iron rods, develop a reddish-brown deposit when left out in the open, indicating that the oxygen in the air has oxidised them.

Fe+O → Fe₂O₃.

This is the chemical process that occurs when iron rusts.

As a result, a new reddish-brown material is created throughout this process, which cannot be stopped. Applying a coating or coat of grease or paint will, however, stop iron from rusting. Another procedure includes depositing a layer of metal (zink and chromium layers might be used). Galvanization is the name of this procedure.

The alloy known as stainless steel is created by alloying iron metal with other metals like chromium and nickel. Stainless steel is robust, resilient, and does not rust at all. Knives, scissors, tools, and decorative items are all made out of stainless steel because it resists corrosion in the manufacturing process. Due to the interaction forces between stainless steel's constituents and the environment, it is used in such applications. Iron, chromium, manganese, silicon, and carbon are the main elements of stainless steel, along with substantial amounts of nickel and molybdenum.

It is essential that chromium be present because it combines with the oxygen in the air to generate a shield that stops corrosion. Additionally, this oxide layer protects the metal's surface against corrosion brought on by the action of too much oxygen and water in the air.