Chemical Engineering MCQs

6108 MCQs  (Page 592 of 611)

Third law of thermodynamics is helpful in___________________?
A. Prediction of the extent of a chemical reaction
B. Calculating absolute entropies of substances at different temperature
C. Evaluating entropy changes of chemical reaction
D. Both b. and c.
Forward reaction will be favoured for the exothermic reaction, represented by CO + H2O ⇌ CO2 + H2, by_________________?
A. Low temperature and high pressure
B. Low temperature and low pressure
C. High temperature and high pressure
D. High temperature and low pressure
Critical temperature is defined as the temperature above which a gas will____________________?
A. Not liquify (barring exceptions)
B. Immediately liquify
C. Never liquify however high the pressure may be
D. None of these
The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for ______________________?
A. Reversible isothermal volume change
B. Heating of a substance
C. Cooling of a substance
D. Simultaneous heating and expansion of an ideal gas
Which of the following is not a reversible process ?
A. Expansion of an ideal gas against constant pressure
B. Atmospheric pressure vaporisation of water at 100°c
C. Solution of nacl in water at 50°c
D. None of these