Question:

The alloy containing about 95% lanthanoids, 5% iron and traces of S, C, Ca and Al which is used in producing Mg-based bullets is:

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Misch metal is well known for its use in pyrophoric applications, notably in lighter flints and in metallurgy to enhance the properties of other metals.
Updated On: Mar 12, 2025
  • bell metal
  • monel metal
  • misch metal
  • bronze
  • german silver
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The Correct Option is C

Solution and Explanation

Misch metal is an alloy consisting predominantly of cerium and other rare earth elements. It typically contains about 95% lanthanoids (primarily cerium, lanthanum, neodymium, and praseodymium), making it rich in pyrophoric properties which are useful in applications like flints for lighters and additives in the metallurgy of magnesium. The alloy often includes small amounts of iron (about 5%) and traces of sulfur, carbon, calcium, and aluminum, fitting the composition mentioned in the question.
Therefore, based on the given composition details, the correct alloy used in the production of magnesium-based bullets, which utilize the unique characteristics of misch metal for improved ignition properties, is indeed misch metal.
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