Boiling point elevation of a solution of NaOH _____________________?

Related Mcqs:

1. Boiling point elevation for a strong and concentrated solution is found by Duhring’s rule, which states that at the same pressure, the boiling point of a solution is a linear function of the _______________ of pure water?

   A. Boiling point
   B. Dynamic viscosity
   C. Kinematic viscosity
   D. Density

2. It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is____________________?

   A. 3.06 × 105
   B. 6.12 × 105
   C. 7.24 × 105
   D. 9.08 × 105

3. In a multiple effect evaporator, the effect of boiling point elevation is to______________________?

   A. Reduce the capacity
   B. Reduce the economy
   C. Increase the economy
   D. None of these

4. Boiling point elevation of an ideal solution_______________?

   A. Increases rapidly with temperature rise
   B. Decreases rapidly with temperature rise
   C. In independent of pressure
   D. Both B. and C.

5. In case of _______________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface?

   A. Nucleate
   B. Local
   C. Pool
   D. Saturated

6. Boiling of milk in an open vessel is an example of ______________ boiling?

   A. Film
   B. Sub-cooled
   C. Saturated nucleate
   D. None of these

7. Boiling point of a solution according to Duhring’s rule is a linear function of the _____________ of water?

   A. Boiling point (at the same pressure)
   B. Viscosity
   C. Density
   D. Thermal conductivity

8. In case of a super-cooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is ________________?

   A. More
   B. Less
   C. Same
   D. More or less; depends on the nature of solution

9. In sub-cooled boiling ?

   A. Temperature of the heating surface is less than the boiling point of the liquid
   B. Temperature of the heating surface is more than the boiling point of the liquid
   C. Bubbles from heating surface are absorbed by the mass of the liquid
   D. Very large vapour space is necessary

10. In the free convection regime of pool boiling, the heat flux is proportional to__________________?

    A. Δt1/2
    B. Δt2
    C. Δt5/4
    D. Δt