Mischmetal is an alloy consisting mainly of :

Solution

Chemistry ma’am · 4 steps

Mischmetal is the NCERT alloy made almost entirely of lanthanoids, with only a little iron added.

1. What it contains. Mischmetal is about 95% lanthanoid metals and about 5% iron, with traces of S, C, Ca and Al.
2. Uses. It is alloyed with magnesium to make bullets, shells and lighter flints. Lanthanoids are reactive and spark easily, and that is why the alloy is useful.
3. No actinoids. Actinoids are radioactive, and most of them are made artificially in tiny amounts. They are not used to make an everyday bulk alloy like this.
4. So. Mischmetal is made mainly of lanthanoid metals, which is option (c).

The idea to keep. Remember mischmetal as about 95% lanthanoids plus about 5% iron. Its uses are Mg alloys for bullets, shells and lighter flints. Actinoids are never part of it.

Answer from the NTA final answer key. Solution by PrepWiser.