Thermodynamic potentials

In a reversible isothermal and isobaric processes, which of the following remains constant

• Internal energy

• Helmholtz function

• Enthalpy

• Gibbs function

When an ideal gas undergoes the Joule-Kelvin expansion, then it shows

• Cooling effect

• Heating effect

• Neither cooling nor heating effect

• Both cooling and heating effects

Joule -Kelvin expansion is an

• isentropic process

• isenthalpic process

• isothermal process

• adiabatic process

The Joule - Thomson Coefficient for an ideal gas is

• zero

• one

• two

• R

For the substances which get contraction on melting, which of the following is correct?

• As pressure increases, melting point decreases

• As pressure increases, melting point increases

• As pressure increases, melting point does not change

• As pressure increases, melting point may increase or decrease

For a system of real gas (or) vender Waal's gas, the potential energy of the system causes due to inter-molecular interactions.

• True

• False

In a reversible isochoric process, heat exchanged by the system gives a measure of change in

• Internal energy

• Enthalpy

• Helmholtz free energy

• Gibb's free energy