JEE Main 2008 Chemistry question

Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being

(1)4 f orbitals more diffused than the 5f orbitals
(2)lesser energy difference between 5f and 6d than between 4f and 5d orbitalsCorrect
(3)more energy difference between 5f and 6d than between 4f and 5d orbitals
(4)more reactive nature of the actinoids than the lanthanoids

Answer: (2)

Solution

In actinoids the 5f, 6d and 7s levels are close in energy, so varying numbers of electrons can be used

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Question ID VK-039068