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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 · Q60 of 120

Geo-Scientist Prelims 2025 Chemistry Q60: For the freezing of 2.0 g of liquid water at 0°C and 1 atm, the…

QuestionThermodynamics / entropy of phase change

For the freezing of 2.0 g of liquid water at 0°C and 1 atm, the change in entropy ΔS is about : (where, enthalpy of fusion of water = 6.0 kJ mol⁻¹)

  1. (a) + 0.8 JK⁻¹
  2. (b) + 1.4 JK⁻¹
  3. (c) – 2.4 JK⁻¹
  4. (d) – 3.6 JK⁻¹

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