A mixture of common salt, ammonium chloride and barium sulphate can best be separated by
addition of water followed by filtration then sublimation
addition of water followed by sublimation then filtration
sublimation followed by addition of water then filtration
fractional distillation
fractional crystallization
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The first separation employed in the question above is sublimation inorder to remove ammonium chloride leaving behind Barium sulphate(BaSO4) which is insolube and common salt..
The next method is by addition of water
BaSO4 being insoluble won't dissolve and common salt being soluble would dissolve in the water..
The next method is by Filtration
The soluble aqueous common salt and BaSO4 would both undergo filtration ..Common salt would pass through as a filtrate and BaSO4 remains in the filter paper as a residue
If you want to separate the common salt ans water you can by either Evaporation to dryness(inorder to obtain only the solute) or Simple distillation[inorder to obtain both solute(NaCl) and solvent(water)]
