The constituents of Alnico are Aluminium, Nickel and

Analysis of the Question

This question tests your knowledge of alloys, specifically the composition of industrial metallic alloys. You are asked to identify the third component of "Alnico," given that it already contains Aluminium and Nickel.

Concept Explanation

An alloy is a mixture of two or more elements, where at least one is a metal. Alloys are created to improve the properties of pure metals, such as increasing hardness, resistance to corrosion, or magnetic strength.

Alnico is a famous family of iron-based alloys that are primarily used for making permanent magnets. The name "Alnico" is actually a portmanteau (a blend of words) derived from the chemical symbols of its three main metallic constituents:

• Al: Aluminium
• Ni: Nickel
• Co: Cobalt

While Alnico alloys also contain iron (Fe) and sometimes small amounts of copper (Cu) or titanium (Ti), the primary defining elements are Aluminium, Nickel, and Cobalt.

Step-by-Step Solution

1. Break down the name: The name "Alnico" is a mnemonic device. • Al = Aluminium • Ni = Nickel • Co = Cobalt
2. Evaluate the options: • A. Mg (Magnesium) - Not a primary constituent of Alnico. • B. Co (Cobalt) - This matches the "co" in Alnico. • C. Mn (Manganese) - Not a primary constituent of Alnico. • D. Cu (Copper) - While sometimes added in small quantities to improve properties, it is not the defining third element that gives the alloy its name.

Conclusion

Based on the composition of the alloy, the third major constituent is Cobalt (Co).

Exam Tip: When you see alloy names like "Alnico," "Brass" (Copper + Zinc), or "Bronze" (Copper + Tin), always look for the mnemonic in the name. It is a very common way for examiners to test your knowledge of alloy compositions!