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The incorrect statement among the following is : (1) Actinoid contraction is greater for element to element than Lanthanoid contraction.

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The incorrect statement among the following is :

(1) Actinoid contraction is greater for element to element than Lanthanoid contraction.

(2) Most of the trivalent Lanthanoid ions are colorless in the solid-state.

(3) Lanthanoids are good conductors of heat and electricity.

(4) Actinoids are highly reactive metals, especially when finely divided.

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Correct answer: (2) Most of the trivalent Lanthanoid ions are colorless in the solid-state.

Explanation:

Most of the trivalent lanthanoid ions are coloured in the solid state.

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