JEE CHEMISTRY UNIT 13
QUIZ NO 3
TOTAL QUESTIONS = 20
1. Which of the following is used to measure the refractive index of liquids?
A. Spectrometer
B. Refractometer
C. Calorimeter
D. Densitometer
2. What is the boiling point of a pure liquid under normal atmospheric pressure?
A. Constant for pure substances
B. Decreases with impurities
C. Varies with impurities
D. Increases with impurities
3. Which method is suitable for separating a mixture of volatile liquids?
A. Vacuum distillation
B. Fractional distillation
C. Simple distillation
D. Steam distillation
4. What is the principle of chromatography?
A. Separation based on adsorption differences
B. Separation based on density differences
C. Separation based on boiling point differences
D. Separation based on solubility differences
5. What is the purpose of adding a boiling chip during distillation?
A. To decrease boiling point
B. To prevent overheating
C. To prevent bumping
D. To increase boiling point
6. Which of the following methods can separate a mixture of two solids with different solubilities?
A. Recrystallization
B. Sublimation
C. Centrifugation
D. Filtration
7. What is the role of silica gel in chromatography?
A. Acts as the mobile phase
B. Acts as the stationary phase
C. Increases the solubility
D. Increases the adsorption capacity
8. Which method is used to purify liquids that decompose at their boiling points?
A. Simple distillation
B. Distillation under reduced pressure
C. Fractional distillation
D. Steam distillation
9. Which gas is commonly used in gas chromatography?
A. Nitrogen
B. Helium
C. Oxygen
D. Argon
10. Which technique is used to analyze the purity of an organic solid?
A. Gas chromatography
B. Refractive index measurement
C. Melting point determination
D. Boiling point determination
11. Which technique is used to separate volatile liquids with close boiling points?
A. Fractional distillation
B. Steam distillation
C. Vacuum distillation
D. Simple distillation
12. Which technique is best for separating amino acids in a mixture?
A. Thin-layer chromatography
B. Paper chromatography
C. Electrophoresis
D. Gas chromatography
13. Which of the following is used to dry an organic solvent?
A. Calcium chloride
B. Anhydrous sodium sulfate
C. Magnesium sulfate
D. Silica gel
14. Which method is used to purify a solid substance that sublimates?
A. Filtration
B. Distillation
C. Centrifugation
D. Sublimation
15. Which of the following is used as the stationary phase in thin-layer chromatography?
A. Silica gel
B. Calcium carbonate
C. Magnesium oxide
D. Activated carbon
16. What is the principle of distillation under reduced pressure?
A. Boiling occurs at a lower temperature
B. Pressure increases boiling point
C. Boiling occurs at a higher temperature
D. Boiling occurs at a constant temperature
17. Which drying agent is commonly used in organic synthesis?
A. Silica gel
B. Calcium chloride
C. Anhydrous sodium sulfate
D. Magnesium sulfate
18. Which of the following is used as a drying agent for organic solvents?
A. Calcium oxide
B. Silica gel
C. Anhydrous sodium sulfate
D. Calcium chloride
19. Which of the following is a qualitative analysis method for organic compounds?
A. Fehling's test
B. Lucas test
C. Tollens' test
D. Lassaigne's test
20. Which of the following is used to separate amino acids in a mixture?
A. Thin-layer chromatography
B. Paper chromatography
C. Gas chromatography
D. Electrophoresis
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