Question

The alloy of Li with 'X' is used to make armour plates. What is 'X'?

• A. Pb
• B. Al
• C. Mg
• D. Cu

Hint:

Mg-Li alloys are among the lightest structural metals available, making them ideal for protective gear (armour) and aerospace where weight reduction is critical.

Answer 1

The Correct Option is C

Step 1: Analyze Lithium Alloys:
Lithium forms several important alloys with other metals:

• Li + Pb (Lead): Known as 'white metal', used for manufacturing bearings for motor engines.
• Li + Al (Aluminium): High tensile strength and lightness, used in aircraft construction.
• Li + Mg (Magnesium): Extremely light and tough. This alloy is specifically used for making armour plates and thermonuclear fusion research components.

Step 2: Identify X:
The question asks for the component used to make armour plates. Based on the uses, X corresponds to Magnesium ($Mg$).
Step 3: Final Answer:
X is Magnesium (Option C).