An ideal gas is expanded from (p_1, V_1, T_1) to (p_2, V_2, T_2) under different conditions. The correct statement(s

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Q 2957056884.     An ideal gas is expanded from (p_1, V_1, T_1) to (p_2, V_2, T_2) under different conditions. The correct statement(s) among the following is(are)

(This question may have multiple correct answers)

A If the expansion is carried out freely, it is simultaneously both isothermal as well as adiabatic
B 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 The work done on the gas is maximum when it is compressed irreversibly from (p_2, V_2) to (p_1, V_1) against constant pressure p1
D The change in internal energy of the gas is (i) zero, if it is expanded reversibly with T_1 = T_2, and (ii) positive, if it is expanded reversibly under adiabatic conditions with T_1 != T_2

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