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

Q11(a). Variable oxidation states of Cr and Mn

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

Question

Why do the transition metals show a large number of oxidation states? Write all the oxidation states of chromium and manganese and mention the most stable state.

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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Coversvariable oxidation stateschromiummanganesetransition metals

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