Mischmetall consists of a lanthanoid metal (95%) and iron (∼ 5%) and traces of \(S\), \(C\), \(Ca\) and \(Al\). Mischmetall used for producing bullets contains:

\(Mg\) based allow

The correct answer is option 2. \(Mg\) based allow.

Mischmetall is an alloy that primarily consists of lanthanoid metals (about 95%) along with a small amount of iron (about 5%) and trace elements such as sulfur (\(S\)), carbon (\(C\)), calcium (\(Ca\)), and aluminum (\(Al\)). Lanthanoid metals in Mischmetall include elements like cerium (\(Ce\)), lanthanum (\(La\)), and others from the lanthanide series, which are known for their reactivity and their ability to improve the properties of alloys.

Magnesium (\(Mg\)) is a lightweight metal that is often used in the creation of alloys to improve specific properties, such as reducing weight while maintaining or even increasing strength. When magnesium is alloyed with other metals, it forms **magnesium-based alloys** that are especially valued in applications where weight is a critical factor, such as in aerospace, automotive, and military industries.

Use in Bullet Production:

Lightweight and High Strength:

Bullets made from magnesium-based alloys are lighter, which means they can achieve higher velocities when fired. This makes them suitable for applications requiring high-speed projectiles. Magnesium also contributes to the overall strength of the alloy, ensuring that the bullets maintain their integrity upon impact.

Reactive Properties:

Magnesium is a highly reactive metal, and when alloyed with lanthanoids, it can enhance the ignition properties of the bullets. This is particularly useful in tracer bullets and pyrotechnic devices, where controlled burning or ignition is necessary.

Compatibility with Lanthanoids:

The presence of lanthanoid metals in Mischmetall, such as cerium (\(Ce\)), enhances the performance of the magnesium-based alloy. Lanthanoids are known to improve the mechanical properties and oxidation resistance of alloys, making them ideal for use in demanding environments like firearms.

Conclusion:

In summary, Mischmetall used in bullet production is associated with magnesium-based alloys because magnesium provides the essential characteristics of lightweight, high strength, and enhanced reactivity, which are crucial for the performance of bullets. The combination of lanthanoids with magnesium in the alloy results in bullets that are not only effective but also optimized for high-speed and high-impact applications.

Thus, the correct answer is option 2: \(Mg\) based alloy.