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Solution


Q.

The incorrect statement among the following is              [2021]
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.  

Ans.

(3)