During Joule-Thomson expansion of gases
A
Enthalpy remains constant
B
Entropy remains constant
C
Temperature remains constant
D
None of these
Correct Answer: Enthalpy remains constant
During, joule-thomson effect basically the change in internal (inter-molecular) energy and change in pressure energy will be equal to zero hence, enthalpy will remain constant.$$\eqalign{ & dU + d\left( {PV} \right) = 0 \cr & \Rightarrow d\left( {U + PV} \right) = 0 \cr & \Rightarrow d\left( H \right) = 0 \cr & {\text{or }}H = {\text{constant}}{\text{.}} \cr} $$
