Column - I and Column - II contains four emtries each. Entries of Column -I are to be matched with some entries of Column - II . One or more than one entries of Column -I may have the matching with the same entries of Column - II. `{:("column-I","column-II"),("(A) peptization ","(P) preparation of sols "),("(B) Ultra centrifugation ",(Q) " Purification of sols "),("(C) Electrodialysis","(R) perparation of metal sols "),("(D) Breding's arc method ","(S) movement of ions acress the membrane in prsence of electric field "):}`
