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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 than Lanthanoid contraction
Detailed Solution
Most of the trivalent lanthanoid ions are coloured in the solid state (due to f-f transitions), not colourless – so this statement is incorrect.
(Lanthanoids are good conductors of heat and electricity, actinoids are highly reactive especially when finely divided, and actinoid contraction is greater from element to element than lanthanoid contraction – all correct.)