31. Degree of freedom of a system consisting of a gaseous mixture of H₂ and NH₃ will be
A. 0
B. 1
C. 2
D. 3
✅ The correct answer is option D.
Thermodynamics MCQs
32. Enthalpy ‘H’ is defined as
A. H = E – PV
B. H = F – TS
C. H – E = PV
D. None of these
✅ The correct answer is option C.
33. Normal temperature and pressure (N.T.P.) corresponds to
A. 0°C and 760 mm Hg
B. 15°C and 760 mm Hg
C. 20°C and 760 mm Hg
D. 0°C and 1 kgf/cm²
✅ The correct answer is option C.
34. The first law of thermodynamics is a restatement of the law of conservation of
A. Mass
B. Energy
C. Momentum
D. None of these
✅ The correct answer is option B.
35. Which is a state function?
A. Specific volume
B. Work
C. Pressure
D. Temperature
✅ The correct answer is option B.
36. A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is
A. Zero
B. Positive
C. Negative
D. None of these
✅ The correct answer is option C.
37. In the reaction; N₂ + O₂ ⇋ 2NO, increasing the pressure will result in
A. Shifting the equilibrium towards right
B. Shifting the equilibrium towards left
C. No change in equilibrium condition
D. None of these
✅ The correct answer is option C.
38. Clayperon equation deals with the
A. Rate of change of vapour pressure with temperature
B. Effect of an inert gas on vapour pressure
C. Calculation of ΔF for spontaneous phase change
D. Temperature dependence of heat of phase transition
✅ The correct answer is option A.
39. In the ammonia synthesis reaction, N₂ + 3H₂ ⇋ 2NH₃ + 22.4 kcal, the formation of NH₃ will be favoured by
A. High temperature
B. Low pressure
C. Low temperature only
D. Both low temperature and high pressure
✅ The correct answer is option D.
40. 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
✅ The correct answer is option A.