1. Following mixture(s) is/are of the irreversible nature:
(a) Positive mixtures
(b) Negative mixtures
(c) Neutral mixtures
(d) None
2. Saturated solution left behind the process of crystallization is called
(a) Final solution
(b) Daughter liquor
(c) Mother liquor
(d) Parent liquor
3. Following is the same for all crystals of the same material
(a) Sizes of the faces of crystal
(b) Size of the edge of the crystals
(c) Angles made by the faces of crystals
(d) All
4. Swenson–Walker crystallizer is a type of
(a) Scrapped surface crystallizer
(b) Agitated batch crytallizer
(c) Static tank crystallizer
(d) Evaporator crystallizer
5. Chose a method to achieve supersaturation for a substance whose solubility is independent of temperature (substance with flat solubility).
(a) Cooling
(b) Evaporation
(c) Precipitation
(d) None
6. Following uses the evaporation technique to achieve super saturation:
(a) Circulation magma crystallizer
(b) Sternson–Walker crystallizer
(c) Static tank crystallizer
(d) All
7. McCabe and Thiele method represents
(a) Graphical method for determining the number of theoretical plates of a fractionating column
(b) Graphical relation between vapour pressure and temperature of component liquids of a mixture
(c) Relationship between the vapour pressure and mole fraction of component of a mixture
(d) None
8. Florentine receiver works on the principle of separation of component liquids of a mixture based on
(a) Molecular weight difference
(b) Density difference
(c) Volume difference
(d) All
9. Following is not true for an azeotropic mixture:
(a) Volatility of each component becomes equal
(b) Relative volatility of mixture is 1
(c) Components of such mixture cannot be fractionated
(d) None
10. Following is most widely used for extraction of volatile oils
(a) Steam distillation
(b) Azeotropic distillation
(c) Molecular distillation
(d) Destructive distillation
11. Fixed oils can be extracted using
(a) Vacuum still
(b) Molecular still
(c) Water still
(d) Fractional distillation
12. A material is termed bone dry if the moisture content is reduced to
(a) EMC (equilibrium moisture content)
(b) Zero moisture
(c) CFMC (critical free moisture content)
(d) None
Answer Keys
1. (b) 2. (c) 3. (c) 4. (a) 5. (b) 6. (a) 7. (a) 8. (b) 9. (d) 10. (a) 11. (b) 12. (b)
Wednesday, January 12, 2022