Test on Introduction to Chromatography
Introduction to Chromatography: Principles & Applications
Test: Chromatography
20 questions
Question 1: In paper chromatography, the pattern formed by the separated substances on the paper is called a chromatogram.
A. Ano
B. Ne
Explanation: The study materials state that the solvent carries the coloured substances in the ink or paint up the paper to form a pattern called a chromatogram.
Question 2: In paper chromatography, a concentrated dot of the mixture is placed near the bottom of special chromatography paper before the paper is dipped into a solvent.
A. Ano
B. Ne
Explanation: The study materials state: "A concentrated dot of the mixture is placed near the bottom of special chromatography paper. The bottom of the paper is dipped into a solvent."
Question 3: Each of the six different inks tested in the experiment shown in diagram D was composed of only a single colour pigment.
A. Ano
B. Ne
Explanation: Diagram D shows that several of the inks, such as black (Bl) and brown (Br), separated into multiple colour bands on the chromatogram, indicating they are mixtures of different colour pigments rather than single colour pigments.
Question 4: Orange squash 2 contains carotene.
A. Ano
B. Ne
Explanation: According to Diagram E, orange squash 2 contains tartrazine and orange*, but not carotene. Natural orange squash and orange squash 3 contain carotene.
Question 5: Is ultraviolet light the only method used to make colourless substances visible for analysis on a chromatogram?
A. Ano
B. Ne
Explanation: The study materials state that chromatograms of colourless substances can be treated to make the substances coloured. Ultraviolet light is mentioned as an alternative method that 'might make the substances glow', but it is not the only method.