Helmholtz free energy A. is defined as____________________?

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

   A. (∂T/∂V)S = – (∂P/∂S)V
   B. (∂S/∂P)T = – (∂V/∂T)P
   C. (∂V/∂S)P = (∂T/∂P)S
   D. (∂S/∂V)T = (∂P/∂T)V

3. Gibbs free energy (F) is defined as__________________?

   A. F = E – TS
   B. F = H – TS
   C. F = H + TS
   D. F = E + TS

4. 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

5. 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

6. The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the_____________________?

   A. Relative humidity
   B. Relative saturation
   C. Percentage saturation
   D. None of these

7. Free energy change of mixing two liquid substances is a function of the__________________?

   A. Concentration of the constituents only
   B. Quantities of the constituents only
   C. Temperature only
   D. All A, B. and C

8. 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

9. Specific/molar Gibbs free energy for a pure substance does not change during________________?

   A. Sublimation
   B. Vaporisation
   C. Melting
   D. Either A, B. or C.

10. Free energy change at equilibrium is____________________?

    A. Zero
    B. Positive
    C. Negative
    D. Indeterminate