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Indian Forest Service (Mains)

Chemistry optional

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

Paper I covers physical and inorganic chemistry.

Indian Forest Service (Mains), Chemistry optional · 2022 · Paper I

Q8(b)(ii). Reducing reactions of sodium–ammonia

Question

What happens when the dilute solution of Na in NH₃ is reacted with (I) O₂ and (II) Fe(CO)₅? Give equations.

Model answer

The free solution for 2022 answers questions 1, 2, 4, 5 and 6, the ones picked in its time plan. Question 8 is answered in full in the IFoS Chemistry Paper I, 2021 to 2025 book, with every part of every paper.

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Cover of UPSC Indian Forest Service (Main) Chemistry Paper I: Model Answers 2021 to 2025
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UPSC Indian Forest Service (Main) Chemistry Paper I: Model Answers 2021 to 2025

  • All eight questions of each paper, with the question printed above its answer
  • Physical chemistry numericals worked with units; inorganic structures drawn
  • Topic-wise weightage and a topic-wise index
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Topic notes: non-aqueous solvents: liquid ammonia, HF, sulfuric acid, SO₂, BrF₃ and superacids, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coverssodium–ammonia reductionssolvated electron reactionsFe(CO)5superoxideliquid ammonia

All parts of Question 8