Which of the following statements are true about column chromatography with sili

Question

Which of the following statements are true about column chromatography with silica gel as the stationary phase and toluene as the mobile phase.   Note that there may be more than one correct answer.

It is important to let the level of the toluene drop to the level of the silica gel before adding the mixture of 2 and 4 nitroaniline.  
Molecule B is toluene.
Water, not toluene, should be used as the mobile phase.
Polar organic molecules will have a WEAK affinity for polar silica gel.
Non-polar organic molecules will have a STRONG affinity for non-polar toluene and a WEAK affinity for polar silica gel.
Polar organic molecules will have a STRONG affinity for polar silica gel.
Molecule D is toluene.
Ionic compounds, like NaCl, will have a STRONG affinity for toluene.
Non-polar organic molecules will have a STRONG affinity for non-polar silica gel.

Explanation / Answer

1)true

2)false

3)true

4)false

5)true

6)true

7)false

8)false

9)true

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