More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is

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more active nature of the actinoids

lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals

greater metallic character of the lanthanoids than that of the corresponding actinoids

more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals

answer is C.

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Detailed Solution

More number of oxidation states are exhibited by the actinides than by the lanthanides due to lesser energy difference between 5f and 6d orbitals than that between 4f and 5d-orbitals.The statement c is correct, larger the value of n+l, lesser the energy difference.

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