Chemical Engineering - MCQ Practice Questions

Which of the following represents a state function?

For a closed system at constant volume, the first law of thermodynamics simplifies to:

The standard Gibbs free energy change (ΔG°) for a reaction at equilibrium is:

A reversible adiabatic process for an ideal gas follows PVᵞ = constant. If γ = 1.4 and initial pressure is 1 atm with volume 1 L, what is the final pressure when volume becomes 0.5 L?

The Helmholtz free energy (A = U - TS) is the maximum useful work available at:

For a van der Waals gas, the critical compressibility factor (Z_c) is approximately:

A heat engine operates between 600 K and 300 K. What is the maximum theoretical efficiency (Carnot efficiency)?

The equation of state for a real gas that considers molecular volume and intermolecular forces is:

For an open system, the steady flow energy equation relates enthalpy rather than internal energy because:

When 100 g of ice at 0°C melts to water at 0°C at 1 atm, the entropy change is approximately (ΔH_fus = 334 J/g):

The fugacity coefficient (φ) for an ideal gas is:

A system undergoes a process where Q = 100 J and W = 60 J. The change in internal energy is:

For a spontaneous process occurring at constant temperature and pressure, which condition must be satisfied?

A throttle valve is used in a refrigeration cycle. This is an example of a(n) _____ process.

The Maxwell relation derived from Gibbs free energy (G = H - TS) is:

A gas mixture at 298 K contains H₂ and N₂. If the mixture obeys Amagat's law and the partial volumes are equal, what is the mole fraction of H₂?

For a non-ideal binary mixture, the activity coefficient (γᵢ) deviates from unity when:

The Clausius-Clapeyron equation relates vapor pressure to temperature. Which assumption is NOT required for its derivation?

A reversible adiabatic process is also known as:

The enthalpy change for a constant pressure process equals: