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UPSC Civil Services (Mains)

Chemistry optional

  • 2 papers
  • 250 marks each
  • 3 h per paper
  • 5 of 8 questions, Q1 and Q5 compulsory

Paper I covers physical and inorganic chemistry.

UPSC Civil Services (Mains), Chemistry optional · 2023 · Paper I

Q3(a). Electronic and molecular geometry of BrF₅ and [ICl₂]⁻

Question

Determine the electronic and molecular geometry of the interhalogen species [BrF₅] and [ICl₂]⁻.

Answer in brief

BrF₅: electron pairs octahedral, molecule square pyramidal; [ICl₂]⁻: electron pairs trigonal bipyramidal, ion linear.

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The full model answer

As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

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Read the whole 2023 solution2023 question paper

Topic notes: VSEPR, hybridisation and Bent's rule, with every Civil Services, IFoS and Geo-Scientist PYQ →

CoversVSEPR theoryBrF5 shapeICl2- shapeinterhalogen compoundshybridisationsquare pyramidal

All parts of Question 3