Which of the following statement(s) is/are incorrect? — Thermodynamics and Thermochemistry Chemistry Question

💡 Solution & Explanation

A: q + w = Δ U, and since U is a state function, Δ U is the same for all paths — A is correct. B: If q=0 (adiabatic) and w=0, Δ U=0, but temperature can still change for real gases or phase transitions — B is incorrect. C: Entropy is a state function, so Δ S_sys is the same for both reversible and irreversible paths between the same two states — C is incorrect. D: For an irreversible adiabatic process, Δ S_sys > 0; zero only for reversible adiabatic — D is incorrect.