An ideal gas is expanded from (p 1 , V 1 , T 1 ) to (p 2 , V 2 , T 2 ) under different…
Chemistry · JEE Advanced · NTA Exams — Chemical Thermodynamics
An ideal gas is expanded from (p1, V1, T1) to (p2, V2, T2) under different conditions. The correct statement(s) among the following is (are) (2017)
- The work done by the gas is less when it is expanded reversibly from V1 to V2 under adiabatic conditions as compared to that when expanded reversibly from V1 to V2 under isothermal conditions.
- The change in internal energy of the gas is (i) zero, if it is expanded reversibly with T1 = T2, and (ii) positive, if it is expanded reversibly under adiabatic conditions with
T1 \(\neq\) T2. - If the expansion is carried out freely, it is simultaneously both isothermal as well as adiabatic
- The work done on the gas is maximum when it is compressed irrversibly from (p2, V2) to (p1, V1) against constant pressure p1.
Answer
(A) The work done by the gas is less when it is expanded reversibly from V 1 to V 2 under adiabatic conditions as compared to that when expanded reversibly from V 1 to V 2 under isothermal conditions., (C) If the expansion is carried out freely, it is simultaneously both isothermal as well as adiabatic, (D) The work done on the gas is maximum when it is compressed irrversibly from (p 2 , V 2 ) to (p 1 , V 1 ) against constant pressure p 1 .
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