Quiz on Chromatography and Extraction Techniques

Which of the following is a reason for performing sample preparation?

• To increase the temperature of the sample

• To remove impurities that could affect results

• To change the physical state of the sample

• To add more solvents to the sample

What does Liquid-Liquid Extraction (LLE) primarily involve?

• Transferring analytes from a solid to a liquid phase

• Transferring analytes between two immiscible liquid phases

• Transferring analytes from a liquid to a solid phase

• Transferring analytes from a gas to a liquid phase

What is the concept of 'like dissolves like' in the context of extraction solvents?

• Polar solvents dissolve polar solutes

• Non-polar solvents dissolve polar solutes

• All solvents can dissolve any solute

• Solvents do not affect solubility

In Solid Phase Extraction (SPE), what is the first step of the typical procedure?

• Elution of analyte

• Washing from impurities

• Loading of sample

• Conditioning

What is the role of the stationary phase in chromatography?

• To carry the components of the mixture

• To dissolve the analytes

• To remain fixed and slow down the components

• To increase the temperature of the mixture

What does the partition coefficient (Kp) indicate in extraction processes?

• The speed of extraction

• The solubility differences between solvents

• The volume of the sample

• The temperature of the extraction

What is the main advantage of using multiple extractions with small quantities of solvent?

• It is more cost-effective

• It simplifies the extraction process

• It improves extraction efficiency

• It reduces the time required for extraction

Which of the following statements about chromatograms is true?

• They represent the temperature of the sample

• They plot detector response against elution time

• They indicate the volume of the sample

• They show the color of the analytes

What does a high resolution in chromatography indicate?

• Wider peaks

• Increased retention time

• Lower efficiency

• Better separation of components

What is the significance of the retention time in chromatography?

• It indicates the temperature of the mobile phase

• It helps identify the components of the mixture

• It measures the volume of the sample

• It determines the speed of the mobile phase