WorksheetsGPC 2
Total questions: 13
Worksheet time: 7mins
Which of the following is essential for the separation of compounds in chromatography?
Large band broadening
Differences in retention of compounds
Identical retention of compounds
Elution without peak separation
What is the term used to describe the relative rate at which a solute migrates through a chromatographic column?
Retention time
Capacity factor (k)
Elution rate
Separation factor
Which of the following retention factor (k) values is considered optimal for chromatography separation?
k < 1
k > 20-30
2 < k < 10
k = 1
Which of the following is a correct statement about retention time (tR)?
It is affected by the flow rate of the mobile phase.
It is the total time required for the mobile phase to pass through the column.
It is the time taken for a solute to reach the detector.
What is the formula for calculating the plate height (H) in chromatography?
H=L/N
H=N/L
H=L/σ2
H=σ/N
What is the purpose of determining the theoretical plate number (N) in chromatography?
To calculate retention factor (k)
To determine column length (L)
To measure the efficiency of separation
To calculate the distribution constant (KD)
Which of the following is true for the separation factor (α) in chromatography?
It measures the rate of elution.
It must be greater than 1 for separation to occur.
It is always less than 1.
It is used to calculate the plate count (N).
Which of the following correctly describes the relationship between plate count (N) and efficiency of a chromatographic system?
Higher N indicates lower efficiency.
Higher N indicates better separation and efficiency.
Lower N means better separation and efficiency.
N is unrelated to the efficiency of a chromatographic system.
How is the peak resolution (Rs) calculated in chromatography?
By measuring the width of the peak at half height.
By using the difference in retention time and the sum of baseline widths of two peaks.
By dividing the column length (L) by the plate count (N).
By calculating the distribution constant (KD).
What does a tailing factor (T) of 1.0 indicate in chromatography?
The peak is symmetrical.
The peak has a trailing edge.
The peak is broadening.
The peak has an asymmetry.
Which factor does NOT influence band broadening in chromatography?
Flow rate of the mobile phase
Diffusion coefficient of analyte
Column packing material
Detector sensitivity
How is the capacity factor (k) related to the interaction between the solute and the stationary phase?
A higher k indicates less interaction with the stationary phase.
A higher k indicates stronger interaction with the stationary phase.
A lower k indicates stronger interaction with the stationary phase.
Capacity factor (k) is not related to solute interaction.
The efficiency of chromatographic separation can be increased by reducing which of the following?
Retention time
Plate height (H)
Retention factor (k)
Separation factor (α)
