
GC & HPLC revision

Quiz
•
Physics, Chemistry
•
University
•
Medium
Hui Li Ng
Used 2+ times
FREE Resource
11 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In gas chromatography, the time taken for a substance to travel through the column is called
Reference time
Retention time
Separation time
Travelling time
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A low Rt (retention time) means the component has a
greater affinity to the stationary phase
greater affinity for the mobile phase
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a full name of FID detector?
Free induction decay
Flame ionization detector
Fuel injection diagnostic
First input delay
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
C-8 and C-18 columns are examples of:
packed columns for GC
capillary columns for GC
normal phase HPLC columns
reverse-phase HPLC columns
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A mixture is injected into a HPLC instrument. The stationary phase used is non-polar and the mobile phase is polar. The chromatogram shown to the left was obtained.
Select the correct conclusion from the following alternatives.
There are three components only in the sample
Compound A is the most polar
Compound C is the most polar
The concentration of each component is similar
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Retention factor, Rf value
Retention time, Rt value
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A mixture of propan-1-ol and butan-1-ol is injected into an HPLC column that is using a polar solvent. The print-out shown to the left is obtained.
A second sample is passed through the same column and produces only one peak with a retention time of 9.4 minutes and an area of 1200 units.
The second sample contains
propan-1-ol and butan-1-ol at lower concentrations than the original solution.
propan-1-ol only, with a concentration that is one-third of the original solution.
butan-1-ol only, with a concentration that is one-third of the original solution.
butan-1-ol only, with a concentration that is three times that of the original solution.
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