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

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the 5f orbitals are more buried than the 4f orbitals

the 5f orbitals extend further from the nucleus than the 4f orbitals

there is a similarity between 4f and 5f orbitals in their angular part of the wave function

the actinoids are more reactive than the lanthanoids

answer is D.

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Detailed 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.

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