The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is________________?

Related Mcqs:

1. 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.

2. Maxwell’s relation corresponding to the identity, dH = dS = Vdp + Σμi dni is_____________________?

   A. (∂T/∂V)S, ni = -(∂P/∂S)V, ni
   B. (∂S/∂P)T, ni = (∂V/∂T)P, ni
   C. (∂S/∂V)T, ni = (∂P/∂T)V, ni
   D. (∂T/∂P)S, ni = (∂V/∂S)P, ni

3. Helmholtz free energy A. is defined as____________________?

   A. A = H – TS
   B. A = E – TS
   C. A = H + TS
   D. None of these

4. The expression, ΔG = nRT. ln(P2/P1), gives the free energy change______________?

   A. With pressure changes at constant temperature
   B. Under reversible isothermal volume change
   C. During heating of an ideal gas
   D. During cooling of an ideal gas

5. The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible _____________ process?

   A. Isobaric
   B. Isothermal
   C. Adiabatic
   D. None of these

6. Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The ratio of chemical potential to free energy of a pure substance at constant temperature and pressure is________________?

   A. 0
   B. 1
   C. ∞
   D. None of these

7. A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is________________?

   A. Zero
   B. Positive
   C. Negative
   D. None of these

8. Gibbs-Helmholtz equation is__________________?

   A. ΔF = ΔH + T [∂(ΔF)/∂T]P
   B. ΔF = ΔH – TΔT
   C. d(E – TS) T, V < 0
   D. dP/dT = ΔHvap/T.ΔVvap

9. The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation_________________?

   A. Increases with pressure rise
   B. Decreases with increasing pressure
   C. Becomes zero at the critical point
   D. Both B. & C.

10. The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by_________________?

    A. Biological oxygen pond
    B. Aerated lagoons
    C. Trickling filters
    D. Gravity separator having oil skimming devices