Which of the following gases is unsuitable for use as a GC carrier gas? All of these Oxygen Nitrogen Helium TRUE ANSWER : ? YOUR ANSWER : ?
Sample injection is considered successful if the sample is concentrated at the start of the column the sample is spread evenly along the column all of the sample in the injector has been added to the column the sample is homogenously spread along the column TRUE ANSWER : ? YOUR ANSWER : ?
Split injection is carried out by splitting the sample into smaller portions to inject at the same time through parallel ports splitting off some of the sample so that it does not enter the column splitting the sample into smaller portions to inject sequentially None of these TRUE ANSWER : ? YOUR ANSWER : ?
The GC trace obtained after an experiment is called a chromatograph chromatogram chromatophore graph TRUE ANSWER : ? YOUR ANSWER : ?
Column bleeding occurs when the column breaks during installation and causes personal injury elution of the analyte is extended over time traces of the stationary phase are eluted the column is cracked and stationary phase leaks out TRUE ANSWER : ? YOUR ANSWER : ?
What does the selectivity factor describe? The proportional difference in widths of two chromatographic peaks The relative separation achieved between two species The maximum number of different species which a column can separate simultaneously None of these TRUE ANSWER : ? YOUR ANSWER : ?
Derivatisation of a sample is carried out to increase volatility of the analytes reduce polarity of the analytes increase the detector response All of these TRUE ANSWER : ? YOUR ANSWER : ?
Helium is generally preferred as carrier gas over nitrogen and hydrogen because it doubles up as a party gas for balloons and funny voices all of above it has a lower viscosity it is inert TRUE ANSWER : ? YOUR ANSWER : ?
Theoretical plates are used to measure the distribution of the analyte between mobile and stationary phases estimate the efficiency of a column None of these determine the thickness of the stationary phase TRUE ANSWER : ? YOUR ANSWER : ?
Sample retention in the column is measured by retention time retention factor retention index all of these TRUE ANSWER : ? YOUR ANSWER : ?