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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 · Q58 of 120

Geo-Scientist Prelims 2026 Chemistry Q58: Which of the following transformations will show positive entropy…

QuestionThermodynamics / entropy change

Which of the following transformations will show positive entropy change ?

  1. 1 mol of H₂O (l, 273 K, 101·325 kPa) → 1 mol of H₂O (s, 273 K, 101·325 kPa)
  2. 1 mol of H₂O (l, 273 K, 101·325 kPa) → 1 mol of H₂O (l, 373 K, 101·325 kPa)
  3. 1 mol of H₂O (l, 373 K, 101·325 kPa) → 1 mol of H₂O (g, 373 K, 101·325 kPa)
  4. 1 mol of H₂O (g, 373 K, 10·1325 kPa) → 1 mol of H₂O (g, 373 K, 101·325 kPa)

Select the correct answer using the code given below :

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

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