JEE Main 2007 Chemistry question

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

(1)the 5f orbitals are more buried than the 4f orbitals
(2)there is a similarity between 4f and 5f orbitals in their angular part of the wave function
(3)the actinoids are more reactive than the lanthanoids
(4)the 5f orbitals extend further from the nucleus than the 4f orbitalsCorrect

Answer: (4)

Solution

5f orbitals are less deeply buried and extend further from the nucleus; the 5f, 6d and 7s energies are close, so

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Question ID VK-038958