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.

I've tried answering this about 5 times now and only have a few more tries. I looked at the other questions and none of them have been right so far. I could really use the help /: I keep getting the feedback: "Polar molecules will have strong affinities for polar mobile or stationary phases. Non-polar molecules will have strong affinities for non-polar mobile or stationary phases" no matter what I choose so now I'm just confused. Thanks in advance

Water, not toluene, should be used as the mobile phase Molecule B is toluene Polar organic molecules will have a WEAK affinity for polar silica gel Polar organic molecules will have a STRONG affinity for polar silica gel 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 Non-polar organic molecules will have a STRONG affinity for non-polar toluene and a WEAK affinity for polar silica gel 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 Molecule D is toluene

Explanation / Answer

Polar organic molecules will have a STRONG affinity for polar silica gel

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

Non-polar organic molecules will have a STRONG affinity for non-polar toluene and a WEAK affinity for polar silica gel

(Non-polar organic molecules will have a STRONG affinity for non-polar silica gel) this may not be true because as far as I know, silica gel is polar.

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