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