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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 · 2020 · Paper II, Chemistry · Q41 of 120

Geo-Scientist Prelims 2020 Chemistry Q41: At what temperature does the total kinetic energy of 0.3 mole of…

QuestionGaseous state / kinetic energy

At what temperature does the total kinetic energy of 0.3 mole of Helium equals the total kinetic energy of 0.4 mole of Argon at 400 K?

  1. (a) 533.3 K
  2. (b) 433.3 K
  3. (c) 346.3 K
  4. (d) 373.0 K

Answer: (a) 533.3 K

Total KE = (3/2) nRT (independent of M). 0.3 × T = 0.4 × 400 → T = 533.3 K → (a).

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