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Thin layer chromatography of ink

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1. In thin layer chromatography (TLC), why is it essential to ensure that the stationary phase is fully dried before analysing the results?

a: To prevent solvent contamination. Explanation

Explanation

b: To reduce the polarity of the stationary phase. Explanation

Explanation

c: To enhance the separation of ink components. Explanation

Explanation

d: Drying the stationary phase is not necessary. Explanation

Explanation

2. What is the Rf value in the context of TLC?

a: The rate of flow of the stationary phase. Explanation

Explanation

b: The distance travelled by the solvent. Explanation

Explanation

c: The ratio of the distance travelled by a component to the distance travelled by the solvent front. Explanation

Explanation

d: The concentration of ink components. Explanation

Explanation

3. Why is it important to experiment with solvents of varying polarities when performing TLC?

a: To increase the thickness of the stationary phase. Explanation

Explanation

b: To reduce the distance travelled by the solvent front. Explanation

Explanation

c: To determine the Rf values of the components. Explanation

Explanation

d: To find a suitable solvent for separating or identifying components. Explanation

Explanation

4. If a solvent with very high polarity is used in TLC, what is the likely outcome?

a: All components will separate effectively. Explanation

Explanation

b: The stationary phase will dissolve. Explanation

Explanation

c: No separation will occur as all components will move with the solvent. Explanation

Explanation

d: Solvent front will not reach the top of the TLC plate. Explanation

Explanation

5. What characteristic of different ink components make their identification possible using TLC?

a: Their colour differences. Explanation

Explanation

b: Their odour. Explanation

Explanation

c: Their solubility in water. Explanation

Explanation

d: Their unique Rf values in specific solvents. Explanation

Explanation

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