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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 · 2018 · Mains Paper I

Q3(a). VSEPR prediction

Question

Write the important points of VSEPR theory. Draw the shape of the following molecules by using VSEPR theory: (i) SF₄ (ii) XeOF₄ (iii) IF₅.

Answer in brief

SF₄ is seesaw; XeOF₄ and IF₅ are square pyramidal.

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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 2018 solution2018 question paper

CoversVSEPR predictionShapes and lone pairs

All parts of Question 3