1. : At which of the following does the organic liquid in steam distillation vaporize?
(A) than its boiling point lower temperature
(B) than its boiling point higher temperature
(C) At its boiling point
(D) None of these
2. : From aniline-water mixture using which one aniline is separated?
(A) Steam distillation
(B) Fractional distillation
(C) Fractional crystallisation
(D) All of these
3. : For separating substances which are _______ steam distillation process is used?
(A) Steam volatile
(B) All of these
(C) Steam volatile and immiscible with water
(D) Steam volatile and miscible with water
4. : ______ type of mixture is collected in a round bottom flask after passing through a steam generator.
(A) organic compound and steam, Mixture of volatile
(B) organic compound and water, Mixture of volatile
(C) inorganic compound and steam, Mixture of nonvolatile
(D) organic compound and water, Mixture of nonvolatile
5. : _______ is an application of surface tension?
(A) Molecular structure will be elucidated
(B) by surface tension measurements through parachor values all of these
(C) in preparations like toothpaste surfactants are incorporated
(D) like cleansing agents use of soaps and detergents
6. : Which of the following is the surface tension of the liquid on increasing the temperature?
(A) Increases
(B) Decreases
(C) Remains constant
(D) None of these
7. : Which of the following is the apparatus used for the determination of surface tension of a liquid?
(A) Oedometer
(B) Stalagmometer
(C) Consolidometer
(D) None of these
8. : The liquid boils when the sum of vapor pressure due to organic liquid and due for watering becomes which one in steam distillation?
(A) Lesser than atmospheric pressure
(B) equals to atmospheric pressure
(C) Greater than atmospheric pressure
(D) None of these
9. : For separating organic compound with water __________ property is not possessed by the organic solvent required.
(A) It is less volatile than water
(B) It is easily vaporizable
(C) It is immiscible with water
(D) more soluble in its organic compound
10. : _______ is the upper layer in differential extraction.
(A) Solvent layer
(B) Solute layer
(C) Aqueous layer
(D) None of these
11. : Which of the following is the unit of surface tension in the CGS system?
(A) Dynes/cm
(B) N/m
(C) Kg/cm
(D) Dynes/m
12. : With the help of which one stalagmometer is cleaned to remove grease?
(A) Distilled water
(B) Chromic acid
(C) Sulphuric acid
(D) Tartaric acid
13. : In the upper solvent layer in differential extraction, ________ the organic compound be present?
(A) After the extraction
(B) During the extraction
(C) Before the extraction
(D) in the upper layer it is always present
14. : From the organic solvent by _________ the organic compound in differential extraction is recovered.
(A) Distillation
(B) Fractional crystallisation
(C) Steam crystallization
(D) Sublimation
15. : Which of the following is the kinetic energy of the liquid molecules on increasing the temperature?
(A) Remains constant
(B) Increases
(C) Decreases
(D) None of these
16. : We get a concave meniscus because the adhesive force between water and glass are which one in case of water and glass than the cohesive forces in the water molecules?
(A) Weaker
(B) Stronger
(C) Same
(D) None of these
17. : Which of the following is the surface tension of water at 25°C?
(A) 72.14 dynes/cm
(B) 90.0 dynes/cm
(C) 82.5 dynes/cm
(D) 45.63 dynes/cm
18. : Because of which one shapes of drops of liquid are spherical?
(A) Conductivity
(B) Surface tension
(C) Absorption
(D) Viscosity