Gas Chromatography A retention gap is placed between the injector and the front of the column to 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 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 ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography Which of the following is not used for detection in GC? Infrared spectroscopy Flame ionisation Electrical conductivity NMR Infrared spectroscopy Flame ionisation Electrical conductivity NMR ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography Derivatisation of a sample is carried out to reduce polarity of the analytes All of these increase volatility of the analytes increase the detector response reduce polarity of the analytes All of these increase volatility of the analytes increase the detector response ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography Which of the following gases is unsuitable for use as a GC carrier gas? Helium All of these Nitrogen Oxygen Helium All of these Nitrogen Oxygen ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography What are the benefits of decreasing the column internal diameter? Reduced risk of column overloading Increased sample capacity Increased resolution All of these Reduced risk of column overloading Increased sample capacity Increased resolution All of these ANSWER DOWNLOAD EXAMIANS APP
Gas Chromatography Which of the following are not used as stationary phases in a GC column? Silica None are used as stationary phases Cyclodextrins Polysiloxanes Silica None are used as stationary phases Cyclodextrins Polysiloxanes ANSWER DOWNLOAD EXAMIANS APP
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