Given below are two statements Statement I: Ferromagnetism is considered as an extreme form of paramagnetism.

Question

Given below are two statements:

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

Statement II: The number of unpaired electrons in a Cr^2+ ion (Z=24) is the same as that of a Nd^3+ ion (Z=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 (Correct answer)
4. D. Statement I is false but Statement II is true

Correct Answer

Option C — Statement I is true but Statement II is false

Detailed Solution & Explanation

The correct answer is Statement I is true but Statement II is false.

Key Points

• Ferromagnetic substances are attracted very strongly in a magnetic field; ferromagnetism is indeed an extreme form of paramagnetism — Statement I is true.
• Cr$^{2+}$ = 3d$^4$ has 4 unpaired electrons; Nd$^{3+}$ = 4f$^3$ has 3 unpaired electrons — they are not equal, so Statement II is false.