COMEDK · Chemistry · 23. d and f Block Elements

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

A greater metallic character of lanthanoids than that of their corresponding actinoids
B more active nature of actinoids
C more energy difference between \(5 f\) and
\(6 d\)-orbitals, than that between \(4 f\) and \(5 d\)-orbitals
D lesser energy difference between \(5 f\) and \(6 d\)-orbitals, than that between \(4 f\) and \(5 d\)-orbitals

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Answer & Solution

Correct Answer

(D) lesser energy difference between \(5 f\) and \(6 d\)-orbitals, than that between \(4 f\) and \(5 d\)-orbitals

Step-by-step Solution

Detailed explanation

More number of oxidation state are exhibited by the actinoids, than by lanthanoids. The main reason for this is lesser energy difference between \(5 f\) and \(6 d\)-orbitals, than that between \(4 f\) and \(5 d\)-orbitals.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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