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NEET Chemistry · Hard

Thermodynamics: Expansion work MCQ

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Expansion workHardQuestion 23015

Question

For irreversible expansion against constant external pressure, work is:

  1. A
    w=−PextΔVw=-P_{ext}\Delta V
    Correct
  2. B
    w=+PextΔVw=+P_{ext}\Delta V
  3. C
    w=0w=0 always
  4. D
    w=ΔUw=\Delta U

Correct answer

w=−PextΔVw=-P_{ext}\Delta V

Explanation

This is the chemistry sign convention for expansion work.

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