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ChemistryNEET 2025Transition elements: trends and properties

The d- and f-Block Elements

Given below are two statements:

Statement I: Ferromagnetism is considered an extreme form of paramagnetism.

Statement II: The number of unpaired electrons in a Cr2+\mathrm{Cr^{2+}} ion (Z=24Z = 24) is the same as that of an Nd3+\mathrm{Nd^{3+}} ion (Z=60Z = 60).

In the light of the above statements, choose the correct answer from the options given below:

  1. A.Both Statement I and Statement II are true
  2. B.Both Statement I and Statement II are false
  3. C.Statement I is true but Statement II is false✓
  4. D.Statement I is false but Statement II is true

Solution

Ferromagnetism is indeed treated as an extreme form of paramagnetism (I true). Cr2+\mathrm{Cr^{2+}} is 3d43d^4 with 4 unpaired electrons; Nd3+\mathrm{Nd^{3+}} is 4f34f^3 with 3 — not the same (II false).

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