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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper II covers chemistry.

UPSC Combined Geo-Scientist, Prelims · 2025 · Paper II, Chemistry · Q50 of 120

Geo-Scientist Prelims 2025 Chemistry Q50: A balloon containing a piece of dry ice (solid CO₂) expands when…

QuestionThermodynamics / work

A balloon containing a piece of dry ice (solid CO₂) expands when the dry ice sublimes. Which one of the following is true about the system ?

  1. (a) Work is done by the system
  2. (b) Work is done on the system
  3. (c) No work is done
  4. (d) Work appears only after the change in state

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