JEE CHEMISTRY UNIT 13
QUIZ NO 2
TOTAL QUESTIONS = 20
1. Which of the following methods can separate immiscible liquids?
A. Separating funnel
B. Centrifugation
C. Chromatography
D. Sublimation
2. Which technique is best for separating a mixture of two miscible liquids with different boiling points?
A. Vacuum distillation
B. Fractional distillation
C. Steam distillation
D. Simple distillation
3. What is the process of separating volatile substances from non-volatile impurities?
A. Sublimation
B. Chromatography
C. Distillation
D. Recrystallization
4. Which solvent is commonly used for recrystallization?
A. Methanol
B. Water
C. Acetone
D. Ethanol
5. What is the purpose of recrystallization?
A. To evaporate the solvent
B. To dissolve the impurities
C. To obtain a pure crystalline solid
D. To filter the impurities
6. What is the purpose of recrystallization?
A. To remove volatile impurities
B. To filter the impurities
C. To purify solids
D. To remove non-volatile impurities
7. Which of the following is a polar solvent?
A. Benzene
B. Hexane
C. Acetone
D. Water
8. Which technique is used to separate and analyze compounds in a mixture?
A. Distillation
B. Gas chromatography
C. Electrophoresis
D. Chromatography
9. What is the principle of distillation under reduced pressure?
A. Boiling occurs at a lower temperature under reduced pressure
B. Pressure increases the boiling point
C. Temperature remains constant
D. Boiling occurs at a higher temperature under reduced pressure
10. Which of the following techniques is used for separating mixtures of dyes?
A. Electrophoresis
B. Column chromatography
C. Thin-layer chromatography
D. Paper chromatography
11. Which gas is commonly used in gas chromatography?
A. Argon
B. Nitrogen
C. Oxygen
D. Helium
12. Which of the following is used to analyze colored substances?
A. Gas chromatography
B. Paper chromatography
C. Thin-layer chromatography
D. Column chromatography
13. Which solvent is commonly used for recrystallization?
A. Acetone
B. Hexane
C. Ethanol
D. Water
14. Which chromatography technique is used for separating volatile compounds?
A. Thin-layer chromatography
B. Gas chromatography
C. Paper chromatography
D. Column chromatography
15. What is the function of silica gel in chromatography?
A. Acts as the stationary phase
B. Catalyzes reactions
C. Acts as the mobile phase
D. Increases solubility
16. What is the boiling point of a pure liquid under standard pressure?
A. Increases with impurities
B. Constant for a pure compound
C. Varies with impurities
D. Decreases with impurities
17. Which of the following is a polar solvent?
A. Benzene
B. Water
C. Methanol
D. Hexane
18. Which gas is commonly used in gas chromatography?
A. Oxygen
B. Helium
C. Argon
D. Nitrogen
19. What is the function of a boiling chip in distillation?
A. Prevents bumping
B. Acts as a catalyst
C. Increases boiling point
D. Prevents overheating
20. Which technique is used for the purification of solids that sublime?
A. Centrifugation
B. Distillation
C. Filtration
D. Sublimation
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