Chromatography techniques

Chromatography techniques Quiz

Spec 3.3.16 · AQA A-Level Chemistry: Quiz

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5 questions, one answer each

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  1. 1. A spot moves 2.4 cm and the solvent front moves 6.0 cm. What is the Rf value?

    • A. 0.25
    • B. 0.40
    • C. 2.5
    • D. 0.60

  2. 2. What is the stationary phase in TLC?

    • A. The solvent
    • B. The mixture being tested
    • C. The carrier gas
    • D. The solid coating on the plate

  3. 3. In GC, which component has the longest retention time?

    • A. The one most strongly retained by the stationary phase
    • B. The one most soluble in the moving gas
    • C. The one with the lowest M(r)
    • D. The one that moves fastest

  4. 4. How is mass spectrometry used with gas chromatography?

    • A. To heat the column
    • B. To make the carrier gas
    • C. To analyse each separated component and help identify it
    • D. To measure the Rf values

  5. 5. Why must the solvent be below the baseline when the plate is placed in the beaker?

    • A. So the plate stays dry
    • B. So the spots do not dissolve into the solvent in the beaker
    • C. So the solvent evaporates quickly
    • D. So the Rf is greater than 1

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