Chapter 18: Qualitative Analysis + Chapter 19: Chromatography

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1. What does Rf stand for?

A Rate factor

B Relative front

C Retention factor

D Reaction factor

2. Which component moves fastest in chromatography?

A Most soluble in stationary phase

B Least soluble in mobile phase

C Most soluble in mobile phase

D Heaviest component

3. In thin-layer chromatography, the stationary phase is usually:

A Paper

B Water

C Silica gel or alumina

D Alcohol

4. Which gas turns potassium dichromate paper green?

A CO₂

B NH₃

C SO₂

D H₂

5. Why lid is closed during chromatography?

A To avoid evaporation of solvent

B To heat the solvent

C To add pressure

D To add air

6. Which gas turns moist red litmus paper blue?

A CO₂

B NH₃

C SO₂

D H₂

7. What is qualitative analysis mainly concerned with?

A Amount of substance

B Nature of substance

C Mass of substance

D Volume of substance

8. Which reagent is used to test carbonate ions?

A Silver nitrate

B Barium chloride

C Dilute acid

D Sodium hydroxide

9. Which application uses chromatography in medicine?

A Identifying drugs

B Measuring pulse

C Blood pressure check

D X-ray

10. Which chromatographic technique is best for school laboratories?

A HPLC

B Gas chromatography

C Paper chromatography

D Ion exchange

Chapter 18: Qualitative Analysis + Chapter 19: Chromatography

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