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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper I covers inorganic chemistry.

UPSC Combined Geo-Scientist, Mains · 2024 · Mains Paper I

Q11(b). High oxidation states in the first d series

Question

Give the trends in the stability of higher oxidation states in the first row d-block metal compounds.

Answer in brief

The common highest oxidation state rises towards Mn(VII), then the highest stable states become less accessible across the later 3d metals; O and F favour high oxidation states.

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Topic notes: transition elements: 3d, 4d and 5d compared, atomic radii and the lanthanide contraction, oxidation states and oxidising power, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversoxidation states 3d seriesfirst row transition metalshigher oxidation state stabilitypermanganateeffective nuclear charge

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