Gas Chromatography Theoretical plates are used to determine the thickness of the stationary phase estimate the efficiency of a column measure the distribution of the analyte between mobile and stationary phases None of these determine the thickness of the stationary phase estimate the efficiency of a column measure the distribution of the analyte between mobile and stationary phases None of these ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography Which of the following detectors give mass flow-dependent signals? Thermal conductivity detector Field ionisation detector Electron capture detector All of these Thermal conductivity detector Field ionisation detector Electron capture detector All of these ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography Which of the following gases is unsuitable for use as a GC carrier gas? Nitrogen All of these Oxygen Helium Nitrogen All of these Oxygen Helium ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography Which of the following are not used as stationary phases in a GC column? None are used as stationary phases Silica Polysiloxanes Cyclodextrins None are used as stationary phases Silica Polysiloxanes Cyclodextrins ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography What does the retention factor, k', describe? The velocity of the mobile phase All of these The distribution of an analyte between the stationary and the mobile phase The migration rate of an analyte through a column The velocity of the mobile phase All of these The distribution of an analyte between the stationary and the mobile phase The migration rate of an analyte through a column ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography In column switching chromatography one column is removed and replaced by another compounds trapped on one column are eluted to another column any of the above the flow to the column is switched on and off repeatedly one column is removed and replaced by another compounds trapped on one column are eluted to another column any of the above the flow to the column is switched on and off repeatedly ANSWER DOWNLOAD EXAMIANS APP
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