Gas Chromatography Which of the following detectors give mass flow-dependent signals? Field ionisation detector Thermal conductivity detector All of these Electron capture detector Field ionisation detector Thermal conductivity detector All of these Electron capture detector ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography What is the typical internal diameter of fused silica capillary columns? 0.3-0.5mm 0.5-1.0 mm 1.0-2.0 mm 0.2-0.3 mm 0.3-0.5mm 0.5-1.0 mm 1.0-2.0 mm 0.2-0.3 mm ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography Sample injection is considered successful if the sample is spread evenly along the column the sample is homogenously spread along the column all of the sample in the injector has been added to the column the sample is concentrated at the start of the column the sample is spread evenly along the column the sample is homogenously spread along the column all of the sample in the injector has been added to the column the sample is concentrated at the start of the column ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography What does the selectivity factor describe? None of these The proportional difference in widths of two chromatographic peaks The maximum number of different species which a column can separate simultaneously The relative separation achieved between two species None of these The proportional difference in widths of two chromatographic peaks The maximum number of different species which a column can separate simultaneously The relative separation achieved between two species ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography What does the retention factor, k', describe? The distribution of an analyte between the stationary and the mobile phase The velocity of the mobile phase All of these The migration rate of an analyte through a column The distribution of an analyte between the stationary and the mobile phase The velocity of the mobile phase All of these The migration rate of an analyte through a column ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography A retention gap is placed between the injector and the front of the column to All of these prevent backflush of the injected solution retain the sample and release it gradually to the column retain contaminants and prevent them from reaching the column All of these prevent backflush of the injected solution retain the sample and release it gradually to the column retain contaminants and prevent them from reaching the column ANSWER DOWNLOAD EXAMIANS APP
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