Stainless steel does not rust because :
- Nickel present in it, does not rust
- Iron forms a hard chemical compound with chromium present in it
- Chromium and nickel combine with iron
- Chromium forms an oxide layer and protects iron from rusting
The Correct Option is D
Approach Solution - 1
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.
Approach Solution -2
The Correct Answer is (D)
Real Life Applications
- Stainless steel is widely used in kitchen utensils because of the property of its rust resistance.
- They also act as a building material like in forming fences and roofs. This is because of its durability.
- Stainless steel is also used in medical appliances (implants). They are biocompatible and less contaminated. Because of the rust free nature, stainless steel is also used in industrial appliances
Question can also be asked as
- What are the properties of stainless steel that prevent it from rusting?
- How does stainless steel resist corrosion?
Learn with videos:
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Concepts Used:
D and F Block Elements
The d-block elements are placed in groups 3-12 and F-block elements with 4f and 5f orbital filled progressively. The general electronic configuration of d block elements and f- block elements are (n-1) d 1-10 ns 1-2 and (n-2) f 1-14 (n-1) d1 ns2 respectively. They are commonly known as transition elements because they exhibit multiple oxidation states because of the d-d transition which is possible by the availability of vacant d orbitals in these elements.
They have variable Oxidation States as well as are good catalysts because they provide a large surface area for the absorption of reaction. They show variable oxidation states to form intermediate with reactants easily. They are mostly lanthanoids and show lanthanoid contraction. Since differentiating electrons enter in an anti-penultimate f subshell. Therefore, these elements are also called inner transition elements.
Read More: The d and f block elements
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