CRYSATALLIZATION
TOP 10 MCQ
1. The more appropriate purpose of spiral scraper in Swenson–Walker crystallizer is [GPAT-2023 SHIFT-II]
(a) Agitation of sample (solution)
(b) Conveying the crystals
(c) Prevent accumulations of crystals on the cooling surface
(d) Provides desired temperature to the sample (solution)
2. Match List I of Unit operations of crystallizers with List II of principle/characteristics/properties
CRYSTALLIZER – UNIT OPERATIONS
1. Swenson–Walker crystallizer
2. Krystal crystallizer
3. Vacuum crystallizer
4. Forced circulation type crystallizer
PRINCIPLE/CHARACTERISTICS/PROPERTIES
[P] Adiabatic evaporative cooling
[Q] Cooling alone
[R] Evaporation, circulation
[S] Heat exchange, separation, circulation
Choose the correct answer from options given below [GPAT-2022]
(a) 1-[P], 2-[Q], 3-[S], 4-[R]
(b) 1-[R], 2-[P], 3-[S], 4-[Q]
(c) 1-[P], 2-[S], 3-[R], 4-[Q]
(d) 1-[Q], 2-[R], 3-[P], 4-[S]
3. In Mier’s theory of supersaturation, solubility chart displays the profile of curve with positive and very low slope in [GPAT-2012]
(a) KNO₃
(b) NaCl
(c) MnSOâ‚„
(d) None of these
4. Which of the following conditions favor formation of large crystals [GPAT-2012]
(a) High degree of supersaturation
(b) Low nucleation rate
(c) High magma density
(d) Rapid cooling of magma
5. Which is three-dimensional arrangement of particles in crystals
(a) Space lattice
(b) Surface angle
(c) Space angle
(d) Surface lattice
6. Formation of crystals by chemical reaction is
(a) Desolations
(b) Seeding
(c) Precipitation
(d) Saturation
7. Spurious nucleation in crystal can be avoided by removing
(a) Solvent
(b) Impurities
(c) Solute
(d) Solution
8. A loose aggregation of molecules/ions to form crystals is called
(a) Aggregates
(b) Cluster
(c) Agglutinins
(d) Agrimoles
9. The clusters may lead to
(a) Embryo
(b) Seed
(c) Rhombohedral rod
(d) Tetrahedral
10. Sequence of crystal growth is
(a) Cluster, Embryo, Nucleus, Crystal
(b) Cluster, Nucleus, Embryo, Crystal
(c) Nucleus, Embryo, Crystal, Cluster
(d) Nucleus, Crystal, Embryo, Cluster
ANSWER KEY
| 1-c | 2-d | 3-b | 4-b | 5-a | 6-c | 7-b | 8-b | 9-a | 10-b |
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