question_answer

  Name the process associated with the following: (a) Dry ice is kept at room temperature and at one atmospheric pressure. (6) A potassium permanganate crystal is in a beaker and water is poured into the beaker with stirring. (c) An acetone bottle is left open and the bottle becomes empty. (d) Milk is churned to separate cream from it. (e) Settling of sand when a mixture of sand and water is left undisturbed for some time. (f) Fine beam of light entering through a small hole in a dark room illuminates the particles in its paths.                                    [NCERT Exemplar]

Answer:

    (a) Sublimation                           (b) Dissolution/diffusion            (c) Evaporation/diffusion (d) Centrifugation (e) Sedimentation            (f) Scattering of light (Tyndall effect)