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)

Options

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
B. The change in internal energy of the gas is (i) zero, if it is expanded reversibly with `T_(1)=T_(2)`, positive, if it is expanded reversibly under adiabatic conditions with `T_(1)neT_(2)`
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 irreversibly from `(p_(2),V_(2))" to "(p_(1),V_(1))`, against constant pressure `p_(1)`

Answer

A, C, D