A. Helmholtz
B. Gibbs
C. Both A. & B.
D. Neither A. nor B.
Related Mcqs:
- For a spontaneous process, free energy__________________?
A. Is zero
B. Increases
C. Decreases whereas the entropy increases
D. And entropy both decrease - Gibbs free energy (G) is represented by, G = H – TS, whereas Helmholtz free energy, A. is given by, A = E – TS. Which of the following is the Gibbs-Helmholtz equation ?
A. [∂(G/T)/∂T] = – (H/T2)
B. [∂(A/T)/∂T]V = – E/T2
C. Both A. and B.
D. Neither A. nor B. - When a gas in a vessel expands, its internal energy decreases. The process involved is________________?
A. Reversible
B. Irreversible
C. Isothermal
D. Adiabatic - In any spontaneous process, ?
A. Only F decreases
B. Only A decreases
C. Both F and A decreases
D. Both F and A increase - _____________ law of thermodynamics ascertains the direction of a particular spontaneous process?
A. Zeroth
B. First
C. Second
D. Third - Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ______________ with the increase of reduced temperature?
A. Decreases
B. Increases
C. Remains constant
D. Decreases logarithmically - If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the____________________?
A. Process must be isobaric
B. Temperature must decrease
C. Process must be adiabatic
D. Both B. and C. - For spontaneous changes in an isolated system (S = entropy) ___________________?
A. ds = 0
B. ds <0
C. ds > 0
D. ds = Constant - A change in state involving a decrease in entropy can be spontaneous, only if ____________________?
A. It is exothermic
B. It is isenthalpic
C. It takes place isothermally
D. It takes place at constant volume - In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about _____________ percent?
A. 0.25
B. 0.5
C. 0.75
D. 1
