The incorrect statement among the following is : (1) Actinoids are highly reactive metals, especially when finely divided. (2) Actinoid contraction is greater for element to element than Lanthanoid contraction. (3) Most of the trivalent Lanthanoid ions are colorless in the solid state. (4) Lanthanoids are good conductors of heat and electricity
Option 3) Most of Lanthanoids in trivalent state are coloured due to unpaired electrons in f - subshell. La+3,Lu+3 are colourless
