UPSC Combined Geo-Scientist, Mains · 2020 · Mains Paper I

Q11(b). Lanthanide ionic radii and ion-exchange separation

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

Question

How do ionic radii vary in the lanthanide series? Describe the separation of lanthanide ions by the ion exchange method.

Model answer

The free solution for 2020 answers questions 1, 3, 4, 7, 8 and 10, the ones picked in its time plan. This part is not answered on the site yet. New answers are announced on Telegram.

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Coverslanthanide contractionion exchange separationlanthanidesEDTA elution

All parts of Question 11

11(a) Variable oxidation states of Cr and Mn10 marks
11(b) Lanthanide ionic radii and ion-exchange separation10 marks
11(c) NiCl₄²⁻, PdCl₄²⁻ and PtCl₄²⁻: structure and magnetism5 marks
11(d) AmO₂⁺ oxidising, Bk³⁺ reducing5 marks