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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

Q9(a). Thermal decomposition of Li, Mg and Na salts; diagonal relationship

Question

What happens when the following salts are strongly heated? Give balanced equations: (i) Li₂CO₃ (ii) LiNO₃ (iii) MgCO₃ (iv) Mg(NO₃)₂ (v) NaNO₃ (vi) Na₂CO₃. From these reactions, can you suggest (with reasons) a relationship between any two of these metal ions? Suggest one more property in favour of this relationship.

Model answer

The free solution for 2018 answers questions 1, 3, 4, 6, 8 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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Coversthermal decompositiondiagonal relationshiplithium magnesiumnitrates and carbonates

All parts of Question 9