Problem 34 - A Complete Resource Book in Chemistry for JEE Main

Question

The percentage of silver in german silver, is (a) \(0 \%\) (b) \(10 \%\) (c) \(2.5 \%\) (d) \(4.5 \%\)

Step-by-Step Solution

Answer

The percentage of silver in german silver is \(0\%\). This corresponds to option (a).

Step 1: Understanding German Silver

German silver, also known as nickel silver, is an alloy consisting primarily of copper, nickel, and zinc. Despite its name, it contains no silver. Therefore, to find the percentage of silver in german silver, we need to recall this key composition information.

Step 2: Applying Composition Knowledge

Since german silver contains no silver at all, any percentage of silver in it would be zero. This directly answers the question based on the understanding of the alloy's composition which lacks silver content altogether.

Step 3: Select the Correct Option

Based on the understanding that german silver has no silver, the percentage of silver is clearly zero. Therefore, the correct option is (a) \(0\%\).

Key Concepts

German Silver

German silver, often known as nickel silver, is a fascinating alloy because, despite its name, it actually contains no silver at all. This is a common source of confusion for many learning about the composition of alloys in chemistry. German silver is composed mainly of:

• Copper: This element usually represents a significant portion of the alloy and is responsible for giving the alloy its basic metallurgical properties.
• Nickel: This component lends the alloy its silvery appearance, making it visually similar to silver.
• Zinc: This metal is often used to enhance the alloy's strength and corrosion resistance.

The reason for the name "German silver" traces back to its similarity in appearance to silver, even though there is none present. Understanding this contradiction is essential, as it appears in various scientific and academic contexts.

Nickel Silver

Nickel silver is an alias for German silver. It's admired for its stunning appearance and versatility. Due to its formulation, it has a silvery sheen, often mimicking the look of true silver without the significant cost. It also offers benefits for manufacturers and jewelers:

• Durability: Nickel silver is highly resistant to tarnish and corrosion, making it an excellent choice for items such as musical instruments, cutlery, and decorative objects.
• Aesthetic Appeal: Its attractive silvery shine makes it popular for crafting jewelry and art pieces.
• Cost-Effective: The absence of real silver keeps production costs lower while still achieving a luxurious appearance.

For students studying alloys, it's important to recognize the economic and physical properties of nickel silver. This includes not just its components but also the rationale behind its widespread use in everyday objects.

Alloys in Chemistry

Alloys are a critical concept in chemistry because they significantly enhance the properties of base metals. By combining several metals, alloys can gain characteristics superior to any of the individual metals alone. Consider these key aspects:

• Improved Strength: Alloys often display increased strength, making them better suited for structural applications in industries like construction and automotive manufacturing.
• Corrosion Resistance: Many alloys are less susceptible to rust and degradation over time, which increases their longevity and reliability.
• Adjustable Composition: The percentage of each constituent metal can be tuned to modify the alloy's properties to fit specific needs.

By understanding the role of alloys in chemistry, students can appreciate the underlying science that enables the creation of materials tailored for modern applications. German silver serves as a practical example, being valued not just for its appearance but also for its balanced physical properties.