Problem- a) A chromatography experiment was carried out using powedered alumina suspended in a pipet and washed out with liquid hexane. A crude organic mixture was put on the column and the various components were washed off the column with hexane. Identify the stationary phase and the mobile phase in this chromatography experiment.
b) In a paper chromatography experiment why is it necessary to apply the spot of the mixture to be analyzed above the level of the solvent?
Please answer only if you are 100% confident