($2$) Distillation : It is used to separate volatile liquids from non-volatile impurities and the liquids having sufficient difference in their boiling point.
($3$) Chromatography : It is based on separation by using stationary and mobile phase.
($4$) Crystallization : It is based on difference in the solubilities of the compound and impurities in a suitable solvent.
(પરમાણ્વીય દળ $Ag =108\,u, Br =80\,u )$.
(આપલું છે $: Ag$નો અણુભાર $108 \,g\, mol ^{-1}$ અને $Cl$ નો અણુભાર $35.5\, g\, mol ^{-1}$ )
(આણ્વિય દળ ${Ba}=137 \,{u})$