CIE iGCSE Co-Ordinated Science C12.3 Chromatography Exam Style Questions Paper 2
Question
Dye X is a mixture of different coloured substances.
Chromatography is used to compare X with three other mixtures, P, Q and R.
The results are shown.
Which mixtures contain dye X?
(A) P, Q and R
(B) P and Q only
(C) P only
(D) R only
▶️Answer/Explanation
Ans: C
Question
The colours in an ink are separated by chromatography.
Which diagram shows the assembled apparatus?
▶️Answer/Explanation
Ans : C
Question
A chromatogram of four different inks, W, X, Y and Z, is shown.
How many inks contain a dye with an Rf value of 0.7?
A) 0
B) 1
C) 2
D) 3
▶️Answer/Explanation
Answer: C
Explanation: The Rf value is calculated as the distance travelled by the substance divided by the distance travelled by the solvent. If two inks have the same Rf value of 0.7, it means they contain a dye with that Rf value.
Question
Which process is used to separate a mixture of coloured compounds?
A. chromatography
B. distillation
C. evaporation
D. filtration
▶️Answer/Explanation
Answer: A
Explanation: Chromatography is a technique used to separate mixtures of coloured compounds based on their different solubilities in a solvent and their affinity for the stationary phase.