Column chromatography uses a stationary and a mobile phase to separate compounds. what is the stationary phase in the column chromatographic purification of crude pentacene derivative?

Column chromatography uses Silica Gel

and stationary phase is Silica Gel

Explanation:

we know that silica get is amorphous and it is  porous form of silicon dioxide.

Silica average pore size is 2.4 nano meters

that have strong affinity for water molecules and it is widely used as a desiccant

and voids may contain some liquids or may be filled by gas or vacuum

Silica gel is a drying agent so it  remove moisture from an enclosed space

so that we found Silica gel packs in boxes containing electronics or new shoes and inside purses or medicine bottles.

and Silica gel is also used to dry the air in industrial compressed air systems

so Column chromatography uses Silica Gel   and stationary phase is Silica Gel

a photo collage of women at work during world war 2

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."