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5. Thermodynamics and thermochemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
If gas, at constant temperature and pressure expands then its
  • A
    Entropy increases and then decreases
  • B
    Internal energy increases
  • ✓
    Internal energy remains the same
  • D
    Internal energy decreases
✓

Answer

Correct option: C.
Internal energy remains the same
(c)We know that internal energy of a gas depends upon its pressure and temperature. Thus if a gas expands at constant temperature and pressure, then its internal energy remains same.

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