. Why do you use a pencil and not a pen to mark TLC plates?

Pencil is always used to mark chromatography paper or TLC plates because ink may run and interfere with the chromatogram. ... As soon as the paper/plate is taken out, mark the solvent front with a pencil before the solvent evaporates and the front becomes impossible to see.

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it

c (diamond),

sio2 (quartz)