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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 · 2026 · Paper II, Chemistry · Q52 of 120

Geo-Scientist Prelims 2026 Chemistry Q52: Consider the reversible isothermal expansion of 5·00 mol of an…

QuestionThermodynamics / reversible isothermal expansion

Consider the reversible isothermal expansion of 5·00 mol of an ideal gas from 0·500 dm³ to 1·500 dm³ at 300 K. (Given : R = 8·314 J K⁻¹ mol⁻¹ and log 3 = 0·4771)

  1. ΔU = 0
  2. ΔH = 0
  3. w = −13·7 kJ
  4. q = 13·7 kJ

Which of the following are true for the above system ? Select the answer using the code given below :

  1. (a) 1 and 2 only
  2. (b) 1, 2 and 3 only
  3. (c) 3 and 4 only
  4. (d) 1, 2, 3 and 4

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