UPSC Combined Geo-Scientist, Mains · 2017 · Mains Paper I

Q10(c). Weak, sharp absorption bands of lanthanides

10 marks
Topic: Chemistry of d- and f-block elements
Question only

Question

Lanthanides typically display weak but sharp absorption bands. Explain.

Model answer

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Coverslanthanidesf-f transitionssharp bandsLaporte forbidden

All parts of Question 10

10(a) Why NH₄Cl/NH₄OH cannot be replaced by NaCl/NaOH in Group III10 marks
10(b) Nuclear stability and packing fraction10 marks
10(c) Weak, sharp absorption bands of lanthanides10 marks