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 :

Options

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

C

Explanation

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