The elevation in boiling point of a solution is proportional to the ______________ of the solution?

Related Mcqs:

1. 80 kg of Na2SO4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na2SO4 .10H2O crystals separate out. The weight fraction of Na2SO4 in the remaining solution is_________________?

   A. 0.00
   B. 0.18
   C. 0.24
   D. 1.00

2. The value of Trouton’s ratio (λb/Tb) for a number of substances is 21 (where, λb = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and Tb = normal boiling point, °K). The Kistyakowsky equation is used for calculation of Trouton’s ratio of _____________ liquids?

   A. Polar
   B. Non-polar
   C. Both A. & B.
   D. Neither A. nor B.

3. Assume that benzene is insoluble in water. The normal boiling points of benzene and water are 80.1 and 100°C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water is__________________?

   A. 80.1°C
   B. Less than 80.1°C
   C. 100°C
   D. Greater than 80.1°C but less than 100°C

4. An Azeotropic solution of two liquids has boiling point lower than either of them, when it_____________?

   A. Is saturated
   B. Is unsaturated
   C. Shows negative deviation from Raoult’s law
   D. Shows positive deviation from Raoult’s law

5. Boiling point of a solution as compared to that of the corresponding solvent is _________________?

   A. Less
   B. More
   C. Same
   D. Either more or less; depends upon the solvent

6. Raoult’s law states that ‘the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component’. This generalisation is based on the assumption that the________________?

   A. Sizes of the component molecules are approximately equal
   B. Attractive forces between like and unlike molecules are approximately equal
   C. Component molecules are non-polar and no chemical combination or molecular association
   between unlike molecules takes place in the formation of the solution
   D. All A., B. & C.

7. Osmotic pressure of a dilute solution of a non volatile solute in a solvent obeying Raoult’s law is proportional to the_____________?

   A. Temperature
   B. Volume of solution
   C. Moles of non-volatile solute
   D. None of these

8. According to Raoult’s law, “The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component.” Raoult’s law is not applicable under the following assumption/condition?

   A. No component is concentrated at the surface of the solution
   B. The component molecules are non polar and are of almost equal size
   C. In the formation of solution, chemical combination/molecular association between unlike
   molecules takes place
   D. The attractive forces between like and unlike molecules are almost equal

9. Vapor pressure of a solution is proportional to (where, Sv and St are mole fraction of solvent and solute respectively) ?

   A. Sv
   B. 1/St
   C. St
   D. 1/Sv

10. A solution with reasonably permanent pH is called a/an _______________ solution?

    A. Ideal
    B. Non-ideal
    C. Buffer
    D. Colloidal