1. The process of applying a mixture of compounds to the top ofa column of a stationary phase is referred to as

packing

running

loading

spotting

2. Relative to the solvent, alumina and silica gel are usuallyconsidered:

extremely non-polar

extremely polar

somewhat polar

somewhat non-polar

3.If you decide to decrease the polarity of the eluent in yourchromatographic run, you should expect the speed at which acompound moves through the column to:

remain unchanged

decrease

become unpredictable

increase

4.The most powerful intermolecular interactions responsible forthe adsorption of molecules to a stationary phase like aluminaare:

large dipole-dipole interactions

hydrogen bonding interactions

small dipole-dipole interactions

london forces

please answer it as soon as possible, Thanks!