3921. 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
✅ The correct answer is option B.
3926. The enthalpy change when ammonia gas is dissolved in water is called the heat of
A. Solution
B. Formation
C. Dilution
D. Combustion
✅ The correct answer is option A.
3931. During a reversible isothermal expansion of an ideal gas, the entropy change is
A. +ve
B. 0
C. -ve
D. ∞
✅ The correct answer is option A.
3936. At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by(where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.)
A. μ° + RT ln f
B. μ°+ R lnf
C. μ° + T lnf
D. μ° + R/T lnf
✅ The correct answer is option A.
3901. Entropy change for an irreversible process taking system and surrounding together is
A. 0
B. > 0
C. < 0
D. None of these
✅ The correct answer is option B.
3904. PVy = constant, holds good for an isentropic process, which is
A. Reversible and isothermal
B. Isothermal and irreversible
C. Reversible and adiabatic
D. Adiabatic and irreversible
✅ The correct answer is option C.
3907. Isobaric process means a constant process.
A. Temperature
B. Pressure
C. Volume
D. Entropy
✅ The correct answer is option B.
3912. Isentropic process means a constant __________ process.
A. Enthalpy
B. Pressure
C. Entropy
D. None of these
✅ The correct answer is option C.
3916. The equation relating E, P, V and T which is true for all substanes under all conditions is given by (∂E/∂V)T = T.(∂P/∂T)H – P . This equation is called the
A. Maxwell
B. Thermodynamic equation of state
C. Equation of state
D. Redlich-Kwong equation of state
✅ The correct answer is option B.
3922. For an isothermal reversible compression of an ideal gas
A. Only ΔE = 0
B. Only ΔH =0
C. ΔE = ΔH = 0
D. DQ = dE
✅ The correct answer is option C.