Related Questions

A change in state involving a decrease in entropy can be spontaneous, only if
A It is exothermic
B It is isenthalpic
C It takes place isothermally
D It takes place at constant volume
For spontaneous changes in an isolated system (S = entropy)
A Ds = 0
B Ds
C Ds > 0
D Ds = Constant
High pressure steam is expanded adiabati-cally and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process:
A ΔH = 0 and ΔS = 0
B ΔH ≠ 0 and ΔS = 0
C ΔH ≠ 0 and ΔS ≠ 0
D ΔH = 0 and ΔS ≠ 0
For a spontaneous chemical process, the free energy change is
A Positive
B Negative
C Zero
D Depends on whether the reaction is exothermic or endothermic
Spontaneous change is one in which there is:
A A lowering of entropy
B A lowering of free energy
C Increase in free energy
D An increase in Internal energy
Entropy change for an irreversible process taking system and surrounding together is
A 0
B > 0
C None of these
For reversible adiabatic process, change in entropy is
A Maximum
B Minimum
C Zero
D Negative
Entropy change in case of reversible adiabatic process is
A Minimum
B Zero
C Maximum
D Indeterminate
The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is
A R loge 4
B R log10 4
C Cv log10 4
D Cv loge 4
In any spontaneous process, the __________ free energy decreases.
A Helmholtz
B Gibbs
C Both A & B
D Neither A nor B

Next steps