Question

87. Approximate percentage of lanthanoid in mischmetal is
(1) 85% (2) 75% (3) 95%
(4) 50%​

Answer 1

Answer:

what mischmetal

Explanation:

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Answer 2

Answer:

The approximate percentage of lanthanoid in mischmetal is (3) 95%.

Explanation:

It exists also called cerium mischmetal, or rare-earth mischmetal. A typical composition contains approximately 55% cerium, 25% lanthanum, and 15~18% neodymium, with traces of other rare earth metals; it includes 95% lanthanides and 5% iron.

Its most typical usage is in the pyrophoric ferrocerium "flint" ignition device of numerous lighters and torches, although an alloy of only rare-earth elements would be too soft to provide good sparks. For this objective, it is blended with iron oxide and magnesium oxide to create a harder material known as ferrocerium. In chemical formulae, it exists commonly abbreviated as Mm, e.g. MmNi5

All lanthanide elements form trivalent cations, Ln3+, whose chemistry exists primarily specified by the ionic radius, which decreases steadily from lanthanum to lutetium. These elements exist named lanthanides because the elements in the series stand chemically similar to lanthanum.

Hence, The approximate percentage of lanthanoid in mischmetal is (3) 95%.

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