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)
JEE 2017 Advanced Paper 1

(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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