The correct option for free expansion of an ideal gas under adiabatic condition is:The correct option for free expansion of an ideal gas under adiabatic condition is: (1) q = 0, $\Delta$T = 0 and w = 0 (2) q = 0, $\Delta$T < 0 and w > 0 (3) q < 0, $\Delta$T = 0 and w = 0 (4) q > 0, $\Delta$T > 0 and w > 0