Question

The alloy formed by beryllium with 'X' is used in the preparation of high-strength springs. 'X' is:

• A. Al
• B. Zn
• C. Cu
• D. Cr

Hint:

Beryllium copper (\( Be-Cu \)) is a unique alloy known for its high strength, electrical conductivity, and corrosion resistance. It is widely used in precision instruments, aerospace applications, and non-sparking tools.

Answer 1

The Correct Option is C

Step 1: Understanding Beryllium Alloys 
Beryllium forms several alloys, but one of the most notable is beryllium copper (\( Be-Cu \)). This alloy is widely used due to its high strength, good electrical conductivity, and non-magnetic properties. 

Step 2: Properties and Applications of Beryllium Copper 
- Beryllium copper (\( Be-Cu \)) is a non-sparking, non-magnetic alloy with excellent strength and corrosion resistance. - It is used in the manufacture of high-strength springs, precision instruments, and aerospace components. - The combination of beryllium with copper enhances mechanical strength while maintaining electrical conductivity. 

Step 3: Evaluating the Given Options 
- Option (1) Al: Beryllium-aluminum alloys exist but are not commonly used for high-strength springs.
- Option (2) Zn: Zinc alloys do not typically involve beryllium in significant amounts for mechanical applications.
- Option (3) Cu: Correct, as beryllium copper is used in high-strength springs.
- Option (4) Cr: Chromium forms strong alloys but is not the primary metal used with beryllium for this application.
Thus, the correct answer is 

Option (3).