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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 · 2023 · Paper I

Q5(e). Amphoteric salts in liquid sulfur dioxide

Question

Give one reaction each to show the amphoteric behaviour of Zn(II) and Al(III) salts in sulfur dioxide.

Answer in brief

Their sulfites can react both with the solvent-system acid, thionyl chloride, and with excess sulfite base, forming soluble sulfito complexes.

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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 →

Coversliquid SO₂amphoterismsolvent system conceptthionyl chloridenon-aqueous solvents

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