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An ideal gas undergoes adiabatic expansi...

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.

Text Solution

Verified by Experts

The correct Answer is:
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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