A. Entropy
B. Gibbs free energy
C. Internal energy
D. All (A), B. & (C)
Related Mcqs:
- Specific ____________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.)?
A. Entropy
B. Internal energy
C. Enthalpy
D. Gibbs free energy - 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 - A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively) ?
A. Δ S1 is always Δ SR
C. Δ S1 is always > Δ SR
D. Δ S1 is always = Δ SR - When a system is in equilibrium for all possible processes, the differential or finite change of entropy is__________________?
A. < 0
B. > 0
C. = 0
D. None of these - “If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them”. This is ______________ law?
A. Hess’s
B. Kirchoff’s
C. Lavoisier and Laplace
D. None of these - At normal boiling point, molar entropy of vaporisation is _____________ Joule/K°.mole?
A. 72
B. 92
C. 142
D. 192
