Question

1) the more strongly a given component of a mixture is absorbed onto the stationary phase on a TLC plate the more/less time it will spend in the mobile phase resulting in a larger/smaller Rf value. (circle the correct answers).

2) in column chromatography, acetylferrocene is strongly absorbed/not strongly absorbed on alumina and moves quickly/slowly through the column with hexane as the eluting solvent (circle the correct answers).

Answer 1

1. The more strongly a given component of a mixture is absorbed onto the stationary phase on a TLC plate the more time it will spend in the mobile phase resulting in a smaller Rf value

If it is absorbed with stationary phase it will show smaller rf value hence it need more mobile to elute it further

2) in column chromatography, acetylferrocene is strongly absorbed on alumina and moves slowly through the column with hexane as the eluting solvent

You have not mentioned any comparison. Actually acetylferrocene is strongly absorbed than ferrocene Hence it moves slowly with mobile phase . But Diacetylferrocene is more strongly absorbed than acetylferrocene