Chromatography Rf

The physical separation of mixtures into individual components is..

• chromatography
• opacity 
• latent
• trace evidence 

Two or more substances that are mixed together but not chemically combined is a ___

• compound
• mixture
• keratin
• chromatography

Two or more substances that are chemically combined is a ___

• compound
• mixture
• solvent
• solute

Ink can be separated by a method of -----------------------------------------------

• distillation

• filtration

• chromatography

• sedimentation

On the chromatogram given -------------- is mixture.

• red
• orange
• green
• black

A pure substance shows ------------------ spot on chromat gram

• 0
• 1
• 2
• 3

The diagram below shows a chromatogram obtained when a sample X was analysed together with four other known dyes P, Q, R and S. Dye Q was known to cause cancer. Which of the following dye(s) is/are safe for use?

• P only
• S only
• P and S
• P and X

In Chromatography the retardation factor R_f are used for identification of components. A high  R_f and a low R_t (retention time) mean the component has a 

• greater affinity to the stationary phase in both TLC and HPLC.
• greater affinity to the stationary phase in TLC but a greater affinity for the mobile phase in HPLC
• greater affinity to the mobile phase in TLC but a greater affininty for the stationary phase in HPLC
• greater affinity to the mobile phase in  both TLC  and HPLC

In Chromatography the retardation factor R_f is used for identification of components. A low R_f and a high R_t (retention time) mean the component has a

• greater affinity to the stationary phase in both TLC and HPLC.

• greater affinity to the stationary phase in TLC but a greater affinity for the mobile phase in HPLC

• greater affinity to the mobile phase in TLC but a greater affininty for the stationary phase in HPLC

• greater affinity to the mobile phase in both TLC and HPLC

In Chromatography the retardation factor R_f are used for identification of components. A low  R_f and a low R_t (retention time) mean the component has a 

• greater affinity to the stationary phase in both TLC and HPLC.
•  greater affinity to the stationary phase in TLC but a greater affinity for the mobile phase in HPLC
• greater affinity to the mobile phase in TLC but a greater affininty for the stationary phase in HPLC
• greater affinity to the mobile phase in  both TLC  and HPLC