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  4. The percentage of lanthanides and iron, respectively, in Misch metal are

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Q. The percentage of lanthanides and iron, respectively, in Misch metal are

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Solution:

Misch metal (from German: Misch metall - "mixed metal") is an alloy of rare earth elements. It is also called cerium misch metal, rare earth misch metal or misch metal. A typical composition includes approximately 50% cerium and 25% lanthanum, with small amounts of neodymium and praseodymium.
In misch metal alloy, the percentage of lanthanides iron are 95 and 5 respectively.