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Learn/ 12th Class Chemistry/ Unit 28 /MCQs

Unit 28: Chromatography — Mcqs

12th Class Chemistry · Unit 28: Chromatography

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Q1.I.Why must the solvent level be below the spot of the dye?
Q1.II.Why do some components of a dye travel further up the paper than others?
Q1.III.A substance has a very low Rf value. What does this indicate?
Q1.IV.Which statement best explains adsorption?
Q1.V.A polar compound in TLC will usually:
Q1.VI.Why is TLC considered faster than paper chromatography?
Q1.VII.What is the role of the carrier gas in gas chromatography?
Q1.VIII.Why must the stationary phase in GC have a high boiling point?
  • a To evaporate quickly
  • b To increase pressure
  • c To remain in liquid form during the process
  • d To react with gases
Q1.IX.What does the area under a peak in a chromatogram indicate?
Q1.X.If two peaks have similar base width but different heights, how can composition be estimated?