How many phases are present at eutectic point ?

Related Mcqs:

1. If a solution of eutectic composition is cooled, _______________ reaching the eutectic temperature ?

   A. The solvent begins to freeze out even before
   B. It will undergo no change until
   C. It will not solidify even on
   D. None of these

2. 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

3. In case of a ternary system involving two liquid components and a solute, the ratio of the concentration of the solute in the two phases at equilibrium is called the distribution co-efficient. The distribution co-efficient depends upon the______________?

   A. Solute concentration
   B. Temperature
   C. Both A. & B.
   D. Neither A. nor B.

4. The equilibrium data of component A in the two phases B and C are given below. The estimate of Y for X = 4 by fitting a quadratic expression of a form Y = mX2 for the above data is ____________________?

   A. 15.5
   B. 16
   C. 16.5
   D. 17

5. 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

6. The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 × __________?

   A. 1026
   B. 1023
   C. 1020
   D. 1019

7. The number of atoms of oxygen present in 11.2 litres of ozone (O3) at N.T.P. are__________________?

   A. 3.01 × 1022
   B. 6.02 × 1023
   C. 9.03 × 1024
   D. 1.20 × 1024

8. The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the_____________________?

   A. Relative humidity
   B. Relative saturation
   C. Percentage saturation
   D. None of these

9. 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

10. One ‘Therm’ is equivalent to___________________?

    A. 105 BTU
    B. 105 kcal
    C. 109 BTU
    D. 109 kcal