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, 2021
UPSC Combined Geo-Scientist, Stage II (Mains). 7 pages, as issued by UPSC.
Every question of 2021, one page each40 parts in 11 questions, with the question as text and the key points of its answer
Question 1 50 marks
- 1(a)Quartz-type aluminophosphate5 marks
- 1(b)Fifth ammonia ligand on copper(II)5 marks
- 1(c)Why hydride and phosphine are strong-field ligands5 marks
- 1(d)Indicator choice for weak-acid titration5 marks
- 1(e)Postprecipitation versus coprecipitation5 marks
- 1(f)Role of mercuric chloride in iron titration5 marks
- 1(g)Chelators in complexometric titrations5 marks
- 1(h)Carbonyl C-O bond strengths5 marks
- 1(i)Balancing nuclear reactions5 marks
- 1(j)Orbital contribution to magnetic moments5 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