1) What is the mobile phase in chromatography? a) Stationary solvent b) Moving solvent c) Solid adsorbent d) Glass plate 2) What is adsorption in chromatography? a) Solvent movement b) Molecule attachment c) Rf value calculation d) Sample evaporation 3) What is a TLC plate made of? a) Coated glass, metal, plastic b) Paper only c) Liquid solvent d) Gas adsorbent 4) How should mixtures be applied to TLC plates? a) Pipette b) Capillary tubes c) Brush d) Dropper 5) What is the purpose of a developing solvent? a) To dissolve samples b) To separate the components c) To dry samples d) To weigh samples 6) What is solvent extraction used for? a) To concentrate samples b) To separate mixtures c) To dry samples d) To weigh samples 7) What is the role of locating agents? a) To identify spots b) To dry samples c) To weigh samples d) To dissolve samples 8) What is paper chromatography used for? a) Separating gases b) Separating pigments c) Weighing samples d) Drying samples 9) What is an Rf value? a) Ratio of fronts b) Retention factor c) Solvent speed d) Sample weight 10) What affects molecule retention in chromatography? a) Polarity b) Weight c) Color d) Temperature 11) What is gas chromatography used for? a) Separating ions b) Analyzing gases c) Weighing solids d) Drying liquids 12) What can cause chromatogram interpretation issues? a) Overloading samples b) Using too little solvent c) Using a large plate d) Using a small plate 13) What is the stationary phase in TLC? a) Solid adsorbent b) Liquid solvent c) Gas adsorbent d) Moving solvent 14) What is ion-exchange chromatography used for? a) Separating ions b) Analyzing gases c) Weighing solids d) Drying liquids 15) What does polarity affect in chromatography? a) Solubility b) Weight c) Color d) Temperature 16) What is the purpose of filtration in sample preparation? a) To remove solids b) To concentrate samples c) To dry samples d) To weigh samples 17) What is the principle of paper chromatography? a) Capillary action b) Evaporation c) Filtration d) Adsorption 18) What is concentration by evaporation used for? a) To concentrate samples b) To separate mixtures c) To dry samples d) To weigh samples 19) What is the role of the mobile phase? a) To move samples b) To weigh samples c) To dry samples d) To dissolve samples 20) What is the purpose of a chromatogram? a) To analyze components b) To weigh samples c) To dry samples d) To dissolve samples

Chromatography in BTEC Applied Science

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