Gas Chromatography Which of the following are not used as stationary phases in a GC column? None are used as stationary phases Polysiloxanes Cyclodextrins Silica None are used as stationary phases Polysiloxanes Cyclodextrins Silica ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography A retention gap is placed between the injector and the front of the column to retain the sample and release it gradually to the column prevent backflush of the injected solution retain contaminants and prevent them from reaching the column All of these retain the sample and release it gradually to the column prevent backflush of the injected solution retain contaminants and prevent them from reaching the column All of these ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography Sample retention in the column is measured by retention index retention time retention factor all of these retention index retention time retention factor all of these ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography What useful information can be found from a Van Deemter plot? Optimum column length Optimum mobile phase flow rate The selectivity factor Optimum column temperature Optimum column length Optimum mobile phase flow rate The selectivity factor Optimum column temperature ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography Derivatisation of a sample is carried out to increase the detector response reduce polarity of the analytes increase volatility of the analytes All of these increase the detector response reduce polarity of the analytes increase volatility of the analytes All of these ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography The column is heated to prevent analyte condensation within the column control elution of the different analytes reduce band broadening to get sharper peaks all of these prevent analyte condensation within the column control elution of the different analytes reduce band broadening to get sharper peaks all of these ANSWER DOWNLOAD EXAMIANS APP
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