Q. The incorrect statement among the following is:
A) Most of the trivalent Lanthanoid ions are colorless in the solid state
B) Lanthanoids are good conductors of heat and electricity
C) Actinoids are highly reactive metals, especially when finely divided
D) Actinoid contraction is greater for element to element that Lanthanoid contraction
Explanation
[Solution] Most trivalent lanthanoid ions are coloured in the solid state and in solution because of f-f transitions (except $f^0$ and $f^{14}$ ions). Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.