JEE CHEMISTRY UNIT 13 QUIZ NO 4 TOTAL QUESTIONS = 20 Mock Test Quiz Free MCQ pyqonline.com

JEE CHEMISTRY UNIT 13
QUIZ NO 4
TOTAL QUESTIONS = 20

1. Which of the following is used as a carrier gas in gas chromatography?

A. Helium B. Oxygen C. Argon D. Nitrogen

2. What is the melting point range for a pure organic solid?

A. Sharp but slightly broad B. Broad and undefined C. Sharp and narrow D. Range above 10°C

3. Which solvent is commonly used for recrystallization of organic compounds?

A. Methanol B. Acetone C. Ethanol D. Hexane

4. What is the function of boiling chips in distillation?

A. Acts as a catalyst B. Prevents bumping C. Increases boiling point D. Prevents overheating

5. Which of the following is used to analyze a mixture of amino acids?

A. Gas chromatography B. Paper chromatography C. Electrophoresis D. Thin-layer chromatography

6. What is the principle of chromatography?

A. Separation based on adsorption differences B. Separation based on boiling point differences C. Separation based on partition coefficient D. Separation based on density differences

7. What is the principle of fractional distillation?

A. Separation based on adsorption differences B. Separation based on polarity differences C. Separation based on density differences D. Separation based on boiling points

8. What is the purpose of a separating funnel?

A. To mix immiscible liquids B. To separate immiscible liquids C. To determine solubility D. To precipitate salts

9. Which of the following methods is suitable for separating immiscible liquids?

A. Separating funnel B. Centrifugation C. Recrystallization D. Chromatography

10. What is the purpose of column chromatography?

A. To separate pigments B. To identify compounds C. To purify mixtures D. To remove impurities

11. What is the principle behind fractional distillation?

A. Different boiling points B. Similar melting points C. Same boiling points D. Boiling under reduced pressure

12. What is the principle of paper chromatography?

A. Separation based on density differences B. Separation based on polarity differences C. Separation based on partition coefficient D. Separation based on solubility differences

13. What is the principle of recrystallization?

A. Temperature differences B. Density differences C. Adsorption differences D. Solubility differences

14. Which of the following methods is suitable for purifying proteins?

A. Centrifugation B. Dialysis C. Distillation D. Steam distillation

15. Which of the following is used to test the purity of an organic solid?

A. Boiling point determination B. Refractive index measurement C. Thin-layer chromatography D. Melting point determination

16. Which technique is used to separate components based on their adsorption on a stationary phase?

A. Centrifugation B. Chromatography C. Distillation D. Sublimation

17. Which solvent is commonly used in recrystallization?

A. Acetone B. Water C. Alcohol D. Ether

18. Which of the following methods is used to purify camphor?

A. Centrifugation B. Sublimation C. Recrystallization D. Filtration

19. What is the role of activated charcoal in purification?

A. To adsorb impurities B. To oxidize impurities C. To decolorize the solution D. To dissolve impurities

20. What is the role of silica gel in chromatography?

A. Acts as the mobile phase B. Increases solubility C. Acts as the stationary phase D. Catalyzes reactions

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