What is the name of the alloy of copper called which contains a composition of 30-35% of zinc?

Brass

The correct answer is option 4. Brass.

Brass is an alloy primarily composed of copper (Cu) and zinc (Zn). The proportion of copper to zinc can vary, resulting in a range of brass compositions with different properties. The specific composition mentioned, containing 30-35% zinc, falls within the typical range for brass alloys.

Here is an explanation of why brass with this composition is significant:

Composition: Brass with 30-35% zinc is commonly referred to as alpha brass. It has a higher zinc content compared to other brass compositions, which typically range from about 5% to 45% zinc. This composition provides a balance of desirable properties such as strength, ductility, and corrosion resistance.

Properties: Brass alloys with higher zinc content tend to have increased strength and hardness compared to alloys with lower zinc content. They also exhibit good corrosion resistance, making them suitable for various applications in both indoor and outdoor environments. Additionally, brass can be easily machined, cast, or formed into intricate shapes, further expanding its versatility.

Applications: Brass with 30-35% zinc is commonly used in a wide range of applications across industries. It is often utilized in the manufacturing of components for plumbing fixtures, such as fittings, valves, and faucets, due to its corrosion resistance and ease of fabrication. Additionally, this type of brass is used in the production of musical instruments, decorative items, electrical connectors, and architectural hardware.

Overall, brass with a composition of 30-35% zinc offers a balanced combination of mechanical properties and corrosion resistance, making it a valuable material for various practical and aesthetic applications.