28. NCERT Exemplar XII

 

 

(a). Dry ice is kept at room temperature and at one atmospheric pressure.

DissolutionEvaporationSublimationDiffusion
(b). A drop of ink placed on the surface of water contained in a glass spreads throughout the water.

DissolutionEvaporationSublimationDiffusion
(c). A potassium permanganate crystal is in a beaker and water is poured into the beaker with stirring. EvaporationSublimationDissolutionDiffusion
(d). A acetone bottle is left open and the bottle becomes empty. EvaporationDissolutionDiffusionSublimation
(e). Milk is churned to separate cream from it. Photo effectCentrifugationSedimentationTyndall effect
(f). Settling of sand when a mixture of sand and water is left undisturbed for some time.

SedimentationPhoto effectTyndall effectCentrifugation
(g). Fine beam of light entering through a small hole in a dark room, illuminates the particles in its paths. SedimentationPhoto effectTyndall effectCentrifugation