1.

In an adiabatic process, no transfer of heat takes place between system and surroundings. Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following.A. `q=0, DeltaT ne 0, W=0`B. `q ne0, DeltaT=0, W=0`C. `q=0, DeltaT=0, W=0`D. `q=0, DeltaT lt 0, W ne 0`

Answer» Correct Answer - C
For free expansion (i.e. in vacuum), `P_("ext")=0`.
Thus, `W-P_("ex")DeltaV=0`
`therefore" "DeltaU=q+W=0` which is true for isothermal process where T is constant i.e., `DeltaT=0.`


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