UPSC Combined Geo-Scientist, Mains · 2026 · Mains Paper I
Q11(c). Cristobalite and its carbon analogue
Question
One of the rarest minerals cristobalite of silica forms basic core unit similar to that of one of the allotropes of carbon. Draw this basic core unit of silica and provide a rationale as to why carbon analogue does not form such network type structure.
Model answer
The free solution for 2026 answers the questions picked in its time plan. Question 11 is answered in full in the Book Edition of the 2026 solutions of Geo-Scientist Chemistry Paper I.
Coverssilica structuresCristobalite and its carbon analogue
All parts of Question 11
- 11(a) Geiger–Müller counter10 marks
- 11(b) Stable pairs of organometallic carbonyls10 marks
- 11(c) Cristobalite and its carbon analogue10 marks