CBSE Class 9 Answered
(a) We cannot separate common salt from common salt - water mixture by using filtration process because common salt is completely soluble in water and hence cannot be filtered off from the solution.
(b) Sea water is trapped in lagoons and allowed to stand for 3-4 days. The heat of sun gradually evaporates water in the lagoons and common salt is left behind as a solid.
Separation of Solid–Liquid MixturesThis video explains evaporation to separate solid-liquid mixtures.
Separation of Solid–Liquid MixturesThis video explains evaporation and chromatography.
Mixtures and their Separation - Exam Decoded - 3This video contains questions on evaporation and chromatography.