The correct sequence is Sublimation; dissolution in water; filtration; evaporation.Concept:Sublimation: It is a process of conversion of a solid directly into vapour, without going into the liquid phase. Filtration: It is the process in which solid particles in a liquid or gaseous fluid are removed by the use of a filter medium that permits the fluid to pass through but retains the solid particles.Evaporation: It is the conversion of liquid into vapour below its boiling point. Explanation:Camphor (ammonium chloride) on heating sublime that is directly converted into vapour. In contrast to this, chalk powder and common salt do not sublime.So, from a mixture, containing ammonium chloride (or camphor), common salt, and chalk powder, ammonium chloride (or camphor) can be easily separated by the process of sublimation. On cooling the vapour of ammonium chloride (or camphor) changes into solid.Common salt is soluble in water but sand is not soluble in water.When a mixture of common salt and chalk powder in water is passed through filter paper, chalk remains on the filter paper but other components of the mixture i.e., common salt and water pass through filter paper.From a solution of common salt in water, common salt can be obtained by evaporation.So, the correct sequence will be Sublimation; dissolution in water; filtration; evaporation.