STANDARDChemistry-f-Block Elements
STANDARD Chemistry Lanthanoids and Actinoids MCQ Question
Type: MCQ-conceptual-Medium-Class 12
The incorrect statement among the following is
A
actinoids are highly reactive metals, especially when finely divided
B
actinoid contraction is greater for element to element than lanthanoid contraction
C
most of the trivalent lanthanoid ions are colorless in the solid state
D
lanthanoids are good conductors of heat and electricity.
Correct Answer
Option C
Detailed Explanation
Most trivalent lanthanoid ions are colored in the solid state due to f-f transitions, not colorless.
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