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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 · Q65 of 120

Geo-Scientist Prelims 2025 Chemistry Q65: Consider the following conditions :

QuestionThermodynamics / Gibbs energy and spontaneity

Consider the following conditions :

  1. ΔH = – ve ΔS = + ve
  2. ΔH = + ve ΔS = – ve
  3. ΔH = – ve ΔS = – ve
  4. ΔH = + ve ΔS = + ve

Which one of the following is correct with respect to the above conditions ?

  1. (a) Condition (1) will always lead to a spontaneous change and condition (2) will never lead to a spontaneous change.
  2. (b) Condition (1) will never lead to a spontaneous change and condition (2) will always lead to a spontaneous change.
  3. (c) Condition (1) will always lead to a spontaneous change and condition (3) will never lead to a spontaneous change.
  4. (d) Condition (3) will always lead to a spontaneous change and condition (4) will never lead to a spontaneous change.

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