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The incorrect statement among the following is :

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Lanthanoids are good conductors of heat and electricity

Actinoids are highly reactive metals, especially when finely divided

Actinoid contraction is greater for element to element than Lanthanoid contraction

Most of the trivalent Lanthanoid ions are colorless in the solid state

answer is C.

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Detailed Solution

Most of the trivalent lanthanoid ions are coloured both in the solid state and in aqueous solutions. Options (1), (2) and (4) are correct statements.

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