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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 · 2019 · Mains Paper I

Q10(c). Silicate units and pyro-, cyclic and chain silicates

Question

Draw the structures of the silicate units [SiO₄]⁴⁻, [Si₂O₇]⁶⁻ and [SiO₃]ₙ²ⁿ⁻ [as given in the paper]. How do these units lead to pyrosilicates, cyclic silicates and chain silicates?

Model answer

The free solution for 2019 answers questions 1, 2, 4, 6, 9 and 11, the ones picked in its time plan. This part is not answered on the site yet. New answers are announced on Telegram.

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Coverssilicatespyrosilicatecyclic silicatechain silicate

All parts of Question 10