Test on Chromatography and Separation Techniques

Question 1: The term 'chromatography' was first used in the 19th century.

A. Ano

B. Ne

Explanation: The term 'chromatography' was first used in 1906 when Russian botanist Mikhail Tsvet wrote a paper about producing a colourful pattern of plant pigments, which falls into the 20th century.

Question 2: Chromatography can be used to compare the unique chromatogram of a red dye found on suspect notes with dye activated on stolen money.

A. Ano

B. Ne

Explanation: The study materials state that a red dye is often activated onto large quantities of money taken from banks, and this dye creates a unique chromatogram that can be compared with suspect notes.

Question 3: According to the study materials, what information can chromatography provide regarding food nutrition?

A. Whether foods contain flavour additives

B. The specific mineral composition of foods

C. The quantity of vitamin content in foods

D. The presence of colour additives in foods

Explanation: The study materials state that foods can be tested using chromatography to see if they contain flavour or colour additives, and also to quantify the vitamin content. It does not mention analyzing the specific mineral composition of foods.

Question 4: According to the provided study materials, which of the following is a correct step in performing chromatography?

A. The solvent is added to the beaker after the paper has been placed inside and the dyes have separated.

B. Spots of the substance are placed on a pencil line drawn on the chromatography/filter paper.

C. The paper is placed into the beaker with the pencil line near the top, away from the solvent.

D. A small amount of solution is placed in a beaker at the very beginning of the process.

Explanation: Step 3 states: 'Spots of the substance are placed on the line, spaced apart,' making option 1 correct. Step 1 states: 'A small amount of solution is placed in a beaker,' making option 3 correct. Option 0 is incorrect because the solution is placed in the beaker first, and the solvent moves up the paper to separate dyes, not the other way around. Option 2 is incorrect because Step 4 clearly states the paper is placed 'with the pencil line at the bottom,' not near the top.

Question 5: Distillation is the recommended technique for separating salt from water.

A. Ano

B. Ne

Explanation: According to the 'Answers Part 2' section, the recommended technique for 'Separating salt from water' (E) is Evaporation, not Distillation.