Statement I : The actinide contraction is more as compared to the lanthanide contraction.
Statement II : 5f electrons have much lower shielding effect as compared to 4f electrons because 5f orbitals are more diffused than 4f orbitals.

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Statement I and Statement II are false.

Statement I is true and statement II is false.

Statement I and Statement II are true.

Statement I is false and Statement II is true.

answer is A.

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Detailed Solution

The actinide contraction is more as compared to the lanthanide contraction.
because 5f electrons have much lower shielding effect as compared to 4f electrons because 5f orbitals are more diffused than 4f orbitals.

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