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JEE Main levelSingle correct optionDifficulty 2 of 3df189

Assertion (A): Early actinoids show a greater range of oxidation states than the corresponding lanthanoids. Reason (R): The , and orbitals of early actinoids are of comparable energy. Choose the correct option.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BBoth A and R are true but R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true

Answer: A

When several subshells lie close in energy, electrons from each can be removed or shared, giving oxidation states such as +3 to +7 for Np and Pu. For lanthanoids the orbitals are much lower in energy, so +3 dominates. R is therefore the correct explanation of A.
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