UPSC Combined Geo-Scientist
Chemist
- 3 descriptive papers
- 200 marks each
- 3 h per paper
Mains Paper I covers inorganic chemistry.
All years
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Mains Paper I, inorganic chemistry
Question paper, 2025
UPSC Combined Geo-Scientist, Stage II (Mains). 8 pages, as issued by UPSC.
Every question of 2025, one page each36 parts in 11 questions, with the question as text and the key points of its answer
Question 1 50 marks
- 1(a)Defect in silver chloride5 marks
- 1(b)Isomerism in [(NH₃)₅CoONO]Cl₂ and [(NH₃)₅CoNO₂]Cl₂5 marks
- 1(c)Trans effect: Niᴵᴵ, Ptᴵᴵ, Pdᴵᴵ5 marks
- 1(d)Phenolphthalein in dilute and in concentrated alkali5 marks
- 1(e)Solubility product of silver chromate5 marks
- 1(f)Colour change interval of diphenylamine5 marks
- 1(g)Eriochrome Black T and calcium5 marks
- 1(h)Tendency to form metal clusters5 marks
- 1(i)Complete the nuclear equations5 marks
- 1(j)First ionisation enthalpy of 5d elements5 marks
Question 2 30 marks
Question 3 30 marks
Question 4 30 marks
Question 5 30 marks
Question 6 30 marks
Question 7 30 marks
Question 8 30 marks
Question 9 30 marks
Question 10 30 marks