2 What acts as stationary phase in paper chromatography? A Water trapped in paper fibers B Ink C Solvent D Air
3 What is a chromatogram? A A type of solvent B The separated pattern of components C The stationary phase D The mobile phase
4 Why is the baseline drawn in pencil? A Ink dissolves in solvent B Pencil dissolves C Ink is colourless D Pencil is darker
5 Which principle is the basis of chromatography? A Difference in solubility B Difference in melting point C Difference in colour only D Difference in density
6 Which factor does NOT affect Rf value? A Type of solvent B Stationary phase C Temperature D Shape of container
7 Which factor affects separation in chromatography? A Boiling point B Affinity for stationary phase C Density only D Mass of solute
8 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
9 Which statement about Rf value is correct? A It is always greater than 1 B It is always negative C It lies between 0 and 1 D It has units
11 Which chromatography gives better separation than paper chromatography? A Thin-layer chromatography B Distillation C Filtration D Evaporation
12 Before starting chromatography, the sample spot should be: A Large and thick B At the top C Small and concentrated D Covered with solvent
13 What does a single spot on chromatogram indicate? A Mixture B Impure substance C Pure substance D Solvent only
14 Which substance will have Rf = 0? A One that moves with solvent B One that does not move C One that moves halfway D One that dissolves fully
16 Which colour component usually moves slowest? A Most soluble B Least adsorbed C Strongly adsorbed D Lightest
18 What is chromatography mainly used for? A Mixing substances B Separating components of a mixture C Heating substances D Measuring temperature
19 Which application uses chromatography in medicine? A Identifying drugs B Measuring pulse C Blood pressure check D X-ray
20 Which is an application of chromatography? A Detecting food dyes B Measuring mass C Heating chemicals D Cooling solutions
22 Which technique is simple and inexpensive? A Gas chromatography B Paper chromatography C HPLC D Column chromatography
23 Which type of chromatography uses silica gel? A Paper chromatography B Thin-layer chromatography C Gas chromatography D Column chromatography
24 Which paper is commonly used in paper chromatography? A Filter paper B Newspaper C Plastic sheet D Carbon paper
25 Rf value is calculated by: A Distance moved by solvent / distance moved by solute B Distance moved by solute / distance moved by solvent C Time / distance D Mass / volume