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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 · 2017 · Mains Paper I

Q2(b). Lewis acidity across the first transition series

Question

In going from left to right of the 1st transition series for bivalent ions, the Lewis acidity steadily increases. Justify your answer.

Answer in brief

Increasing effective nuclear charge and generally decreasing ionic size enhance electron-pair attraction, giving a broad rise in Lewis acidity; the trend is not strictly monotonic for every ion or ligand.

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The full model answer

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CoversLewis acidity across the first transition seriesPeriodic trends and coordination

All parts of Question 2