Multiple choice

Which of the following is an alloy of rare earth elements?

  1. Nisil

  2. Mischmetal

  3. Terne

  4. Spiegeleisen

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mischmetal is an alloy of rare earth elements in various naturally-occurring proportions. A typical composition includes approximately 50% cerium and 25% lanthanum, with small amounts of neodymium and praseodymium. Its most common use is in the flint ignition device of many lighters and torches.