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  4. The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because

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Q. The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because

AIEEEAIEEE 2007The d-and f-Block Elements

Solution:

The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is because the 5f orbitals extend further from the nucleus than the 4f orbitals.
Hence, (4) is correct.