An ideal gas undergoes adiabatic expansion against constant external pressure. Which of the foll...

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An ideal gas undergoes adiabatic expansion against constant external pressure. Which of the following is incorrect?
(a) Temperature of the system decreases.
(b) The relation \( \mathrm{PV}^{\gamma}= \) constant will be valid (where \( \mathrm{P} \) and \( \mathrm{V} \) are gas variables).
(c) \( \Delta \mathrm{E}+\mathrm{P}_{\mathrm{ext}} \Delta \mathrm{V}=0 \)
(d) Enthalpy of the gas remains unchanged.
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