Thin-Layer Chromatography Quiz

What is the main purpose of thin-layer chromatography (TLC)?

• To separate non-volatile mixtures

• To determine the boiling point of compounds

• To separate volatile mixtures

• To measure the density of liquids

What is the stationary phase in TLC typically made of?

• Silica gel, aluminium oxide, or cellulose

• Ethanol

• Water

• Sodium chloride

How is the baseline marked on a TLC plate?

• With a pencil

• With a marker

• With a crayon

• With a pen

What is the role of the mobile phase in TLC?

• To provide a color change

• To react with the sample

• To carry the sample mixture up the plate

• To dissolve the stationary phase

What happens to the component with less affinity to the stationary phase?

• It travels further up the TLC plate

• It does not move

• It travels slower on the plate

• It evaporates

What type of stationary phase is generally used in TLC?

• Ionic

• Neutral

• Non-polar

• Polar

How are colorless substances visualized on a TLC plate?

• By using a UV lamp or chemical reagents

• By adding water

• By heating the plate

• By using a magnifying glass

What is the retention factor (RF) in TLC?

• The distance the solvent front traveled

• The distance the compound traveled divided by the distance the solvent front traveled

• The time taken for the solvent to reach the top

• The thickness of the stationary phase

Which compound is more polar based on RF values?

• Compound with RF equal to 0

• Compound with RF equal to 1

• Compound with lower RF

• Compound with higher RF

What is the purpose of marking the solvent front on the TLC plate?

• To identify the compounds

• To calculate the RF values

• To measure the thickness of the plate

• To determine the color of the solvent