Q. 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:
A) Both Statement I and Statement II are true
B) Both Statement I and Statement II are false
C) Statement I is true but Statement II is false
D) Statement I is false but Statement II is true
Explanation
[Solution by Claude - not from source] Statement I is true. $Cr^{2+}$ is $3d^4$ (4 unpaired e$^-$); $Nd^{3+}$ is $4f^3$ (3 unpaired e$^-$), so Statement II is false. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.