10. An on-column is used present in the sample. An injection (a) when a very sma
ID: 1072580 • Letter: 1
Question
10. An on-column is used present in the sample. An injection (a) when a very small amount of analyte is (b) when the sample decomposes above its boiling point. (c) when the sample is not going to be used for quantitative analysis. 11. Decreasing the thickness of the stationary phase leads to (a) decreased plate height, decreased retention time, and decreased capacity for the analyte. (b) decreased plate height, decreased retention time, and increased capacity for the analyte. (c) decreased plate height, increased retention time, and decreased capacity for the analyte. 12. Compared with packed columns open tubular columns offer (a) higher resolution, shorter analysis time, greater sensitivity, and larger sample capacity. (b) higher resolution, shorter analysis time, greater sensitivity, and lower sample capacity (c) higher resolution, longer analysis time, greater sensitivity, and larger sample capacity. 13. Which terms/items are associated with GC? (a) Temperature programming, sample loop, and thermal conductivity. (b) Temperature programming, air blank, and thermal conductivity. (c) Temperature programming, reversed phase, and thermal conductivity. 14. In GC, separation between two different solutes occurs because (a) the solutes have different solubilities in the mobile phase. (b) the solutes volatilize at different rates in the injector. (c) the solutes spend different amounts of time on the stationary phase.Explanation / Answer
15. (a)
Flame ionization detector (FID) and Thermal conductivity detector (TCD) are the most commonly used detectors. They both are sensitive to a wide range of components and concentrations. The Electron capture detector (ECD) are used for the detection of molecules containing electronegative / withdrawing elements and functional groups (halogens, carbonyl, nitriles, nitro groups, and organometalics). Some gas chromatographs also known as GC-MS are connected to a mass spectrometer which acts as the detector.
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