The retention factor is used

• to zero the chromatography scale

• to identify unknown compounds in a sample

• to retain solvent

• as a starting tool for chromatography

Thin layer chromatography is

• partition chromatography

• electrical mobility of ionic species

• adsorption chromatography

• none of the above

Ion-Exchange chromatography:

• separate and analyze compounds that can be vaporized without decomposition

• Also known as Liquid-Solid Chromatography

• Separation based on partition coefficient between 2 immiscible liquids

• Materials used are either cation or anion resins

Which of the following is correct about chromatography?

• It separates those solutes that dissolve in the same solvent.

• It separates those solutes that dissolve in different solvents.

• It separates a solute that dissolves in a solid solvent.

• It separates gaseous solutes from liquid solvents.

The presence of more than one spot on the TLC plate shows that____

• the Rf value is higher than it should be

• the solvent used was too dilute

• impurities are present

• too much solvent was used

chromatography separates the mixture of dyes on the basis of their ---------------------------

• gravity

• solubility

• density

• boiling point

Chromatography separates a mixture of...

• Solutes

• Solutions

• Solvents

• compounds

A pure substance shows ------------------ spot on chromatogram

• 0

• 1

• 2

• 3

The R_f value for the red component is

• 0.3

• 0.7

• 10

• 7

Dyes in water soluble markers may be separated by means of..

• crystallization

• sublimation

• chromatography

• sedimentation