A. Entropy
B. Internal energy
C. Enthalpy
D. Gibbs free energy
Related Mcqs:
- ____________ 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) - Specific _____________ does not change during phase change at constant temperature and pressure?
A. Entropy
B. Gibbs energy
C. Internal energy
D. Enthalpy - Sublimation temperature of dry ice (solid CO2) is ____________ °C?
A. -273
B. 0
C. -78
D. 5 - 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 - Change of state namely evaporation condensation, freezing and melting is an _______________ process?
A. Isothermal
B. Adiabatic
C. Isobaric
D. Isochoric - There is a change in ______________ during the phase transition?
A. Volume
B. Pressure
C. Temperature
D. All a, b & c - 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. - 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 - At normal boiling point, molar entropy of vaporisation is _____________ Joule/K°.mole?
A. 72
B. 92
C. 142
D. 192 - 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)
