Which of the following detectors give concentration-dependent signals? Thermal conductivity Electron-capture detector All of these Infra-red detector TRUE ANSWER : ? YOUR ANSWER : ?
What does the retention factor, k', describe? The velocity of the mobile phase The migration rate of an analyte through a column The distribution of an analyte between the stationary and the mobile phase All of these TRUE ANSWER : ? YOUR ANSWER : ?
The column is heated to control elution of the different analytes all of these reduce band broadening to get sharper peaks prevent analyte condensation within the column TRUE ANSWER : ? YOUR ANSWER : ?
Which of these effects result from slow injection of a large sample volume? Increased resolution Non-linear detector response Decreased resolution Constant resolution TRUE ANSWER : ? YOUR ANSWER : ?
Doubling the column's length increases resolution by a factor of (2)0.5 3 4 2 TRUE ANSWER : ? YOUR ANSWER : ?
Headspace analysis is carried out in order to analyse volatile compounds from solid or liquid samples analyse the column contents ahead of the sample determine the psychological state of the tutor determine non-volatiles TRUE ANSWER : ? YOUR ANSWER : ?
Which of the statements is correct? Gas chromatography is used to analyse gases All of these Gas chromatography is used to analyse gases, solutions and solids Gas chromatography is used to analyse solids TRUE ANSWER : ? YOUR ANSWER : ?
What are the benefits of decreasing the column internal diameter? Increased sample capacity Increased resolution Reduced risk of column overloading All of these TRUE ANSWER : ? YOUR ANSWER : ?
Sample retention in the column is measured by all of these retention time retention index retention factor TRUE ANSWER : ? YOUR ANSWER : ?
Resolution is proportional to the square root of the number of theoretical plates in a column cube root of the number of theoretical plates in a column square of the number of theoretical plates in a column number of theoretical plates in a column TRUE ANSWER : ? YOUR ANSWER : ?