GPC 1
Authored by Fauziahanim Zakaria
Chemistry
University
Used 18+ times
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9 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which statement best describes the principle of chromatography?
A method to identify chemical structures.
A technique to separate components in a mixture using their distribution between two phases.
A method used to increase the concentration of an analyte.
A process to determine molecular weight.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the function of the stationary phase in chromatography?
To move analytes through the column.
To provide a medium for analytes to interact and separate.
To increase the velocity of the mobile phase.
To detect the analyte concentration.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why are sharp and symmetrical peaks desirable in chromatography?
They reduce retention time.
They improve qualitative and quantitative analysis.
They help increase sample size.
They minimize the void volume.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If the stationary phase strongly interacts with a solute, what will happen to the solute’s retention time?
It will increase.
It will decrease.
It will remain constant.
It depends on the mobile phase composition.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calculate the number of theoretical plates (N) if the column length (L) is 25 cm and the plate height (H) is 0.05 cm.
500
100
1250
250
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What adjustment would you make to reduce band broadening caused by longitudinal diffusion?
Increase the flow rate of the mobile phase.
Decrease the temperature of the system.
Use a larger particle size in the column.
Reduce the mobile phase flow rate.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A solute is showing fronting in its chromatographic peak. What could be a likely cause?
A high flow rate of the mobile phase.
Sample concentration is too high
Insufficient interaction with the stationary phase.
The detector is malfunctioning.
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