On a thin layer chromatographic plate,an organic compound moved by $3.5 \ cm$,while the solvent moved by $5 \ cm$. The retardation factor of the organic compound is . . . . . . $\times 10^{-1}$.

State whether the following statements are True or False:
$(i)$ The boiling points of chloroform and aniline are $334 \ K$ and $457 \ K$ respectively.
$(ii)$ The vapour of chloroform is obtained after aniline in simple distillation.
$(iii)$ Chloroform is more volatile than aniline.

Which one of the following mixtures can be separated by steam distillation technique?

By the crystallisation of an impure compound,if the mother liquor becomes coloured,what shall be done to remove the colour?

What is the purification method based on the principle that the compound and the impurities have different solubilities in a given solvent?

Which of the following compounds is used as an adsorbent in column chromatography?