Trouton’s ratio is given by (where λb, = molal heat of vaporisation of a substance at its normal boiling point, kcal/kmol Tb = normal boiling point, °K) ___________________?

Related Mcqs:

1. At normal boiling point, molar entropy of vaporisation is _____________ Joule/K°.mole?

   A. 72
   B. 92
   C. 142
   D. 192

2. The chemical potential for a pure substance is ____________ its partial molal free energy?

   A. More than
   B. Less than
   C. Equal to
   D. Not related to

3. If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH4(g) + C2H4(g) ⇌ C3H8(g) will be _____________ Kcal?

   A. -19.4
   B. -30.2
   C. 55.2
   D. -55.2

4. Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The ratio of chemical potential to free energy of a pure substance at constant temperature and pressure is________________?

   A. 0
   B. 1
   C. ∞
   D. None of these

5. Even though heat transfer co-efficient in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to ________________ boiling ?

   A. Film
   B. Nucleate
   C. Transition
   D. All modes of

6. The change in Gibbs free energy for vaporisation of a pure substance is___________________?

   A. Positive
   B. Negative
   C. Zero
   D. May be positive or negative

7. The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation_________________?

   A. Increases with pressure rise
   B. Decreases with increasing pressure
   C. Becomes zero at the critical point
   D. Both B. & C.

8. At higher temperatures, molal heat capacities for most of the gases (at constant pressure) _______________ with increase in temperature?

   A. Varies linearly
   B. Increases
   C. Decreases
   D. Does not vary

9. The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 – T2)/T1. The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T1 and T2 is given by__________________?

   A. T1/(T1-T2)
   B. T2/(T1-T2)
   C. T1/T2
   D. T2/R1

10. Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of _____________________?

    A. Sublimation
    B. Fusion
    C. Transition
    D. Vaporisation