1) Chromium Or Nickel in metals n CabOn in nOn metal is Used To Make Iron Strong.. n Hard2) It's is a Mixture.. Of Mercury With A Metal.. But Main to Silver- Mercury Hote H3) Zinc is Used In galVanisation Of iRon

1) Carbon
Carbon is a nonmetallic element that plays a crucial role in making iron hard and strong. It is widely used in the production of steel, which is an alloy of iron and carbon. The addition of carbon to iron alters its microstructure, resulting in a material with enhanced hardness and strength.

When iron is heated in the presence of carbon, the carbon atoms diffuse into the iron lattice, forming a solid solution. This process is known as carburization. The carbon atoms occupy interstitial positions within the iron lattice, creating localized areas of high hardness. This significantly increases the strength of the iron, allowing it to resist deformation and withstand higher loads.

The carbon content in steel can be varied to achieve different mechanical properties. Low-carbon steels contain less than 0.25% carbon and are relatively soft and ductile, while high-carbon steels contain around 0.6-1.5% carbon and are much harder and stronger. The addition of carbon also improves the wear resistance and toughness of steel, making it suitable for a wide range of applications, including construction, automotive, and manufacturing industries.

2) Mercury
Mercury is a metal that is often alloyed with other metals to form amalgams. An amalgam is a mixture of mercury with one or more other metals. The most common use of mercury amalgams is in dental fillings, where they are mixed with silver, tin, or other metals to create a malleable and durable material that can be shaped to fill cavities.

The unique properties of mercury, such as its low melting point, high density, and ability to form alloys with various metals, make it an ideal component for amalgams. When mercury is combined with another metal, it forms a homogeneous mixture due to its ability to dissolve metals at room temperature. This allows for easy manipulation and shaping of the amalgam during dental procedures.

Amalgams have been used in dentistry for over a century due to their excellent durability, longevity, and resistance to corrosion. They provide a strong and reliable filling material that can withstand the forces of chewing and grinding. Furthermore, mercury amalgams have antimicrobial properties, which help prevent the growth of bacteria and protect against secondary tooth decay.

3) Zinc
Zinc is a metal that is commonly used to galvanize iron articles. Galvanization is a process in which a protective zinc coating is applied to iron or steel to prevent corrosion. This is achieved through a process called electroplating, where a thin layer of zinc is deposited onto the surface of the iron article.

Zinc is an excellent choice for galvanizing due to its unique properties. It has a higher electrode potential than iron, which means it is more likely to undergo oxidation and protect the underlying iron from corrosion. When the iron article is immersed in a bath containing a zinc compound and an electric current is applied, zinc ions are reduced at the surface of the iron, forming a layer of metallic zinc.

The zinc coating acts as a barrier between the iron and the surrounding environment, preventing moisture and oxygen from coming into contact with the iron surface. This effectively inhibits the formation of rust and extends the lifespan of the iron article. Zinc also has the ability to self-heal, meaning that if the coating is damaged, the exposed zinc will sacrificially corrode before the iron, further protecting it from rusting.

In summary, carbon is used