Explain (ii) Column chromatography.

Give the principle involved in each of the give processes : (a) Mond process for refining of Ni, (b) Column chromatography for purification of rare elements.

Mention the substances used as adsorbents in column chromatography.

Give an example of each of: (i) adsorption chromatography and (ii) partition chromotography.

Explain the principal of paper chromatography.

Explain the purification of compounds by using thin layer chromatography.

{:("Column - I","Column - II"),("(A) Coloured bands","(i) Zone refining"),("(B) Volatile compound from impure metal","(ii) Fractional distillation"),("C) Purification of Ge and Si","(iii) Mond process"),("(D) Purification of Hg","(iv) Chromatography"),(,"(v) Liquation"):}

Write the principle behind the following : Chromatography

Name two metals which are purified by chromatography.

Al_(2)O_(3) is used in _____ chromatography.

What criterion is followed for the selection of the stationary phase in chromatography?