Specific ____________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.)?

Related Mcqs:

1. ____________ does not change during phase transformation processes like sublimation, melting & vaporisation?

   A. Entropy
   B. Gibbs free energy
   C. Internal energy
   D. All (A), B. & (C)

2. Specific _____________ does not change during phase change at constant temperature and pressure?

   A. Entropy
   B. Gibbs energy
   C. Internal energy
   D. Enthalpy

3. Sublimation temperature of dry ice (solid CO2) is ____________ °C?

   A. -273
   B. 0
   C. -78
   D. 5

4. The change in Gibbs free energy for vaporisation of a pure substance is___________________?

   A. Positive
   B. Negative
   C. Zero
   D. May be positive or negative

5. Change of state namely evaporation condensation, freezing and melting is an _______________ process?

   A. Isothermal
   B. Adiabatic
   C. Isobaric
   D. Isochoric

6. There is a change in ______________ during the phase transition?

   A. Volume
   B. Pressure
   C. Temperature
   D. All a, b & c

7. 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.

8. Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition that the molar volume of liquid is negligible compared to that of the vapor ?

   A. d ln p/dt = Hvap/RT2
   B. d ln p/dt = RT2/Hvap
   C. dp/dt = RT2/Hvap
   D. dp/dt = Hvap/RT2

9. At normal boiling point, molar entropy of vaporisation is _____________ Joule/K°.mole?

   A. 72
   B. 92
   C. 142
   D. 192

10. Trouton’s ratio is given by (where λb, = molal heat of vaporisation of a substance at its normal boiling point, kcal/kmol Tb = normal boiling point, °K) ___________________?

    A. λb/Tb
    B. Tb/λb
    C. √(λb/Tb)
    D. √(Tb/λb)