Question

In chromatography, which of the following statements is INCORRECT for R_f?
1. R_f value depends on the type of chromatography.
2. The value of R_f cannot be more than one.
3. Higher R_f value means higher adsorption.
4. R_f value is dependent on the mobile phase.

Answer 1

Correct Answer - Option 3 : Higher R_f value means higher adsorption.

Concept:

Chromatography is a laboratory technique for the separation of a mixture. The mixture is dissolved in a fluid called the mobile phase, which carries it through a structure holding another material called the stationary phase. 

The R_fvalue is defined as the ratio of the distance moved by the solute (stationary phase) and the distance moved by the solvent (mobile phase) along the paper.

1. R_f value depends on the type/medium of chromatography.

2. The value of R_f ranges from zero to one.

3. When the plate most rapidly, then the R_f value is higher while the adsorption is less.

4. R_f value is dependent on the mobile phase and stationary phase.

Thus, option (c) is the incorrect statement related to R_f.