An ideal gas undergoes adiabatic expansion against constant external pressure. Which of the following is incorrect.
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 `PV^(gamma)=` constant will be valid (where `P` and `V` are gas variables)
C. `Delta E+P_(ext)Delta V=0`
D. Enthalpy of the gas remains unchanged.
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Correct Answer - B::D
In adiabatic expansion, `q=0`. So `Delta E-W= -P_(ext)Delta V`.
Irreversible adiabatic So `PV^(gamma)=` constant not valid.
since `q=0`, so gas does work by utilizing its internal energy.
So, `T` decreases and also enthalpy `(H)` decreases.
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