WorksheetsThin Layer Chromatogrphy
Total questions: 10
Worksheet time: 8mins
Name
Class
Date
1.
The physical separation of mixtures into individual components is..
a)
chromatography
b)
opacity
c)
latent
d)
trace evidence
2.
Ink can be separated by a method of -----------------------------------------------
a)
distillation
b)
filtration
c)
chromatography
d)
sedimentation
3.
chromatography separates the mixture of dyes on the basis of their ----------------------------
a)
density
b)
solubility
c)
gravity
d)
boiling point
4.
On the chromatogram given -------------- is mixture.
a)
red
b)
orange
c)
green
d)
black
5.
A pure substance shows ------------------ spot on chromat gram
a)
0
b)
1
c)
2
d)
3
6.
The diagram below shows a chromatogram obtained when a sample X was analysed together with four other known dyes P, Q, R and S. Dye Q was known to cause cancer. Which of the following dye(s) is/are safe for use?
a)
P only
b)
S only
c)
P and S
d)
P and X
7.
In Chromatography the retardation factor Rf are used for identification of components. A high Rf and a low Rt (retention time) mean the component has a
a)
greater affinity to the stationary phase in both TLC and HPLC.
b)
greater affinity to the stationary phase in TLC but a greater affinity for the mobile phase in HPLC
c)
greater affinity to the mobile phase in TLC but a greater affininty for the stationary phase in HPLC
d)
greater affinity to the mobile phase in both TLC and HPLC
8.
A student extracts the colour from some green smarties and uses paper chromatography to separate components colours. She finds blue has a Rf =0.38 and yellow Rf =0.75 this suggests
a)
the yellow is more strongly adsorbed onto the stationary phase and is less solublein the mobile phase.
b)
the yellow is more strongly adsorbed onto the stationary phase and is more soluble in the mobile phase.
c)
the blue is more strongly adsorbed onto the stationary phase and is less solublein the mobile phase.
d)
the blue is more strongly adsorbed onto the stationary phase and is less solublein the mobile phase.
9.
A high Rf value indicates strong
a)
strong affinity to the stationary phase
b)
strong affinity to the mobile phase
c)
no affinity to the stationary phase
d)
no affinity to the stationary phase
10.
The Rf value for the red component is
a)
0.3
b)
0.7
c)
10
d)
7
100 %
