Question

In an adibatic process, no transfer of heat takes place between system and surroundings. Choose the correct option for free expansion of an ideal gas under adiabatic conditions from the following :
A. `q = 0, Delta T !=0, W = 0`
B. `q!=0, Delta T = 0, W = 0`
C. `q = 0, Delta T = 0, W = 0`
D. `q =0, Delta T lt 0, W != 0`

Answer 1

Correct Answer - C
Free expansion, `W = 0`
Adiabatic process, `q = 0`
`Delta U = q + W = 0`, this means that internal energy remains constant. Therefore, `Delta T = 0` In ideal gas there is no intermolecular attraction.
Hence, when such a gas expands under adiabatic conditions into a vacuum, no heat is absrobed or evolved since no external work is done to separate the molecules