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

Related Mcqs:

1. A liquid is in equilibrium with its vapor at its boiling point. On an average, the molecules in the liquid and gaseous phases have equal______________?

   A. Kinetic energy
   B. Intermolecular forces of attraction
   C. Potential energy
   D. Total energy

2. Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas)__________________?

   A. T
   B. √T
   C. T2
   D. 1/√T

3. The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal _____________ in the two phases?

   A. Potential energy
   B. Intermolecular forces
   C. Kinetic energy
   D. Total energy

4. 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) ___________________?

   A. λb/Tb
   B. Tb/λb
   C. √(λb/Tb)
   D. √(Tb/λb)

5. If 1 Nm3 of O2 contains ‘N’ number of molecules, then number of molecules in 2Nm3 of SO2 will be_________________?

   A. N
   B. N/2
   C. 2N
   D. 4N

6. The heats of vaporisation of CS2, C2H5OH &H2O are 26.8, 38.6 & 40.6 KJ/kg.mole respectively. The order of decreasing inter-molecular forces in these liquids is________________?

   A. H2O > C2H5OH > CS2
   B. CS2 > C2H5OH > H2O
   C. H2O > CS2 > C2H5OH
   D. CS2 > H2O > C2H5OH

7. Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition that the molar volume of liquid is negligible compared to that of the vapor ?

   A. d ln p/dt = Hvap/RT2
   B. d ln p/dt = RT2/Hvap
   C. dp/dt = RT2/Hvap
   D. dp/dt = Hvap/RT2

8. “The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface”. This statement pertaining to the solubility of gases in liquid is the ______________ law?

   A. Raoult’s
   B. Henry’s
   C. Amagat’s
   D. None of these

9. 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

10. Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature ?

    A. Chlorine
    B. Nitrogen
    C. Ethane
    D. All the gases will have the same KE