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  • Question

  • 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


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

  • Correct Answer
  • H2O > C2H5OH > CS2 

    • Stoichiometry problems

    Search Results

    • 1. Cp/Cv for monoatomic gases is

    • Options
    • A. 1.44
    • B. 1.66
    • C. 1.99
    • D. 1
      • Discuss
    • 2. The unit of specific heat at constant pressure, Cp, in SI unit is

    • Options
    • A. W/m2°C
    • B. J/kg°K
    • C. W/m°K
    • D. J/m3°K
      • Discuss
    • 3. The unit of dynamic viscosity is

    • Options
    • A. stoke
    • B. poise
    • C. gm/cm sec.
    • D. both (b) & (c)
      • Discuss
    • 4. The density of a liquid is 1500 kg/m3. Its value in gin/litre will be equal to

    • Options
    • A. 1.5
    • B. 15
    • C. 150
    • D. 1500
      • Discuss
    • 5. 2 litres of nitrogen at N.T.P. weighs __________ gms.

    • Options
    • A. 14
    • B. 2.5
    • C. 28
    • D. 1.25
      • Discuss
    • 6. The reverse process of fractional crystallisation is called

    • Options
    • A. stripping
    • B. leaching
    • C. differential distillation
    • D. absorption
      • Discuss
    • 7. Molality is defined as the number of gm moles of solute per __________ of solvent.

    • Options
    • A. litre
    • B. kg
    • C. gm mole
    • D. gm
      • Discuss
    • 8. Saturated molal absolute humidity of the vapor-gas mixture depends upon the

    • Options
    • A. vapor pressure at dry bulb temperature
    • B. total pressure
    • C. both (a) and (b)
    • D. neither (a) nor (b)
      • Discuss
    • 9. Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m3 . The diffusivity of aniline in air is 0.74xl0-5m2/s.The numerical value of mass transfer co-efficient is 7.4 x 10-3. Its units are

    • Options
    • A. m/s
    • B. cm/s
    • C. mole/m2.s.Pa
    • D. kmole/m2.s.Pa
      • Discuss
    • 10. The heat of vaporisation __________ with increase in pressure.

    • Options
    • A. increases
    • B. decreases
    • C. becomes zero at critical pressure
    • D. both (b) and (c)
      • Discuss

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