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

Related Mcqs:

1. 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.

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

   A. Molal concentration
   B. Reciprocal of the molal concentration
   C. Normality
   D. Molarity

3. 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

4. Boiling point of a non-homogeneous mixture of immiscible liquids is _____________ that of any one of its separate components?

   A. Lower than
   B. Higher than
   C. Equal to
   D. Either A. or B.; depends on the liquids

5. 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

6. Heat of solution in a system in which both solute and solvent are liquids is termed as_________________?

   A. Heat of solvation
   B. Heat of hydration
   C. Standard integral heat of solution
   D. Heat of mixing

7. 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

8. On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes_________________?

   A. 1
   B. 8
   C. 4
   D. 2

9. Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution) ?

   A. log (1/H+)
   B. – log (1/H+)
   C. 1/log H+
   D. None of these

10. Na2SO4. 10H2O crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of Na2SO4. The final concentration of the solute in the solution is 10%. The weight of crystals is________________?

    A. 20
    B. 32.2
    C. 45.35
    D. 58.65