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

Related Mcqs:

1. The expression, nRT ln(P1/P2), is for the _____________of an ideal gas?

   A. Compressibility
   B. Work done under adiabatic condition
   C. Work done under isothermal condition
   D. Co-efficient of thermal expansion

2. 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.

3. 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

4. The equation, PV = nRT, is best obeyed by gases at____________________?

   A. Low pressure & high temperature
   B. High pressure & low temperature
   C. Low pressure & low temperature
   D. None of these

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. 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

7. 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

8. Gibbs free energy of a pure fluid approaches _____________ as the pressure tends to zero at constant temperature?

   A. Infinity
   B. Minus infinity
   C. Zero
   D. None of these

9. The free energy change for a chemical reaction is given by (where, K = equilibrium constant)________________?

   A. RT ln K
   B. -RT ln K
   C. -R ln K
   D. T ln K

10. 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