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Question

Mischmetal is an alloy consisting mainly of


A

lanthanoid and actinoid metals

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B

lanthanoid metals

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C

actinoid metals

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D

actinoid and transition metals

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Solution

The correct option is B

lanthanoid metals


The explanation for the Correct answer:

(B) Lanthanoid metals: Lanthanides are very dense metals having a higher melting point than the d-block elements.

  1. They combine with other metals to form alloys.
  2. These are elements of the f block, often referred to as inner transition metals.
  3. Inner transition elements and ions can have electrons in s, d, and f-, orbitals.
  4. Mischmetal – Well-known alloy is mischmetal which consists of Lanthanoid metal (~ 95%) and iron (~ 5%) and Traces of C, D, Ca, and Al.

The Explanation of all incorrect answers:

(A) Lanthanoid and actinoid metals: The first group of elements of the F series, known as the lanthanides, consists of substances whose atomic numbers range from 57 to 71.

  1. These substances do not emit radiation (except for promethium, which is radioactive).
  2. The second group of elements, known as actinides, consists of substances whose atomic numbers range from 89 to 103.
  3. These substances are generally radioactive in nature.

(C) Actinoid metals: The first element in the series, actinium, is where the name "actinide chain" originated.

  1. Any of the elements of the actinide series with atomic numbers 89 to 103 in the periodic table are represented by the symbol An.

(D) Actinoid and transition metals: The second group of elements of the F series, known as the actinides, consists of substances with atomic numbers ranging from 89 to 103, These substances are typically radioactive in nature.

  1. The f block components are called internal transition elements because the f orbital is closer to the nucleus than the d orbital.

Hence, Option(B) is correct.


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