Chromatographic Techniques MCQs
Chromatographic techniques are essential analytical methods used to separate, identify, and analyze components in a mixture. These types of techniques, including paper, thin-layer, and gas chromatography play a crucial role in pharmaceuticals, forensics, and chemical research. Explore our MCQs on chromatographic techniques to enhance your understanding and test your knowledge effectively.
- What is the stationary phase in paper chromatography?
- A) A liquid solvent
- B) A gas
- C) A paper sheet or strip
- D) A thin-layer plate
- Answer: C) A paper sheet or strip
- Who discovered paper chromatography?
- A) Robert Boyle
- B) Synge and Martin
- C) Mikhail Tsvet
- D) Einstein
- Answer: B) Synge and Martin
- Which of the following is the principle of thin-layer chromatography (TLC)?
- A) Partitioning
- B) Solubility
- C) Adsorption
- D) All of the above
- Answer: D) All of the above
- What is the main advantage of paper chromatography?
- A) Requires large sample size
- B) Inexpensive and simple
- C) Requires complex instruments
- D) Used only for gas samples
- Answer: B) Inexpensive and simple
- What is the retardation factor (Rf) in chromatography?
- A) Distance traveled by solute / Distance traveled by solvent
- B) Distance traveled by solvent / Distance traveled by solute
- C) Distance traveled by column
- D) Distance traveled by detector
- Answer: A) Distance traveled by solute / Distance traveled by solvent
- What is the most commonly used stationary phase in TLC?
- A) Water
- B) Silica gel
- C) Helium
- D) Acetone
- Answer: B) Silica gel
- Which of the following is NOT a type of chromatography?
- A) Paper chromatography
- B) Gas chromatography
- C) Liquid chromatography
- D) Magnetic chromatography
- Answer: D) Magnetic chromatography
- What is the mobile phase in gas chromatography?
- A) Liquid solvent
- B) Stationary phase
- C) Carrier gas
- D) Adsorbent
- Answer: C) Carrier gas
- What type of chromatography is best for separating proteins?
- A) Paper chromatography
- B) Gas chromatography
- C) Gel permeation chromatography
- D) HPLC
- Answer: C) Gel permeation chromatography
- Which chromatography technique is commonly used for drug testing in sports?
- A) Paper chromatography
- B) Column chromatography
- C) Gas chromatography
- D) Thin-layer chromatography
- Answer: C) Gas chromatography
- What is the role of binders in TLC plates?
- A) To help the sample dissolve
- B) To enhance the binding of adsorbents
- C) To act as a mobile phase
- D) To prevent sample loss
- Answer: B) To enhance the binding of adsorbents
- Which of the following is NOT a commonly used adsorbent in TLC?
- A) Silica gel
- B) Alumina
- C) Cellulose powder
- D) Gold
- Answer: D) Gold
- In HPLC, what does the mobile phase consist of?
- A) A solid
- B) A liquid solvent
- C) A gas
- D) None of the above
- Answer: B) A liquid solvent
- What is the function of the detector in chromatography?
- A) Separates compounds
- B) Measures the amount of compound present
- C) Adsorbs the sample
- D) Mixes the solvents
- Answer: B) Measures the amount of compound present
- What is the purpose of a guard column in HPLC?
- A) To protect the main column
- B) To speed up separation
- C) To mix solvents
- D) To change the pH of the mobile phase
- Answer: A) To protect the main column
- Which of the following statements is correct about ion-exchange chromatography?
- A) Separates molecules based on their charge
- B) Separates molecules based on size
- C) Uses helium as a carrier gas
- D) Detects only colorless compounds
- Answer: A) Separates molecules based on their charge
- What is a common application of gas chromatography?
- A) Analyzing proteins
- B) Identifying pollutants in air samples
- C) Detecting bacterial growth
- D) Measuring blood sugar levels
- Answer: B) Identifying pollutants in air samples
- Which column type is most commonly used in HPLC?
- A) Open tubular column
- B) Packed column
- C) Paper column
- D) None of the above
- Answer: B) Packed column
- Which factor affects separation in size-exclusion chromatography?
- A) Molecular size
- B) Polarity
- C) Charge
- D) None of the above
- Answer: A) Molecular size
- What is the ideal property of a solvent in HPLC?
- A) High viscosity
- B) High boiling point
- C) Should be miscible with mobile phase
- D) Should be completely non-polar
- Answer: C) Should be miscible with mobile phase
- In reversed-phase HPLC, which phase is more polar?
- A) Mobile phase
- B) Stationary phase
- C) Both have the same polarity
- D) Neither is polar
- Answer: A) Mobile phase
- What type of chromatography is most suitable for analyzing volatile compounds?
- A) Ion-exchange chromatography
- B) Gel chromatography
- C) Gas chromatography
- D) Paper chromatography
- Answer: C) Gas chromatography
- Which factor is crucial for choosing a mobile phase in gas chromatography?
- A) Solubility
- B) Molecular weight
- C) Boiling point
- D) Adsorption properties
- Answer: C) Boiling point
- What is the main function of a flame ionization detector in GC?
- A) Detects UV absorbance
- B) Detects ions by burning
- C) Separates molecules
- D) Identifies molecular weight
- Answer: B) Detects ions by burning
- What does HPLC stand for?
- A) High Pressure Liquid Chromatography
- B) High Performance Liquid Chromatography
- C) High Polarity Liquid Chromatography
- D) Hybrid Process Liquid Chromatography
- Answer: B) High Performance Liquid Chromatography
- What is the main use of gradient elution in chromatography?
- A) To separate molecules of different sizes
- B) To optimize separation efficiency
- C) To detect ions
- D) To enhance the color of the sample
- Answer: B) To optimize separation efficiency
- Which of the following is an application of ion-exchange chromatography?
- A) Protein purification
- B) Gas analysis
- C) Separating pigments
- D) Analyzing DNA fragments
- Answer: A) Protein purification
- What is the purpose of a suppressor in ion chromatography?
- A) Increases elution rate
- B) Reduces background conductivity
- C) Detects fluorescence
- D) None of the above
- Answer: B) Reduces background conductivity
- What is the major disadvantage of GC?
- A) Cannot analyze volatile substances
- B) Requires a non-aqueous sample
- C) Cannot separate ions
- D) All of the above
- Answer: B) Requires a non-aqueous sample
- What does retention time (Rt) represent?
- A) Time taken for a sample to elute
- B) Distance moved by solvent
- C) Detector response time
- D) None of the above
- Answer: A) Time taken for a sample to elute
