Answer:
(a) The process is sublimation because when dry ice (solid
CO2) is kept at room temperature at one atmospheric pressure, it
sublimes leaving no residue.
(b) This process is diffusion because in diffusion, mixing
of one substance (ink) into another substance (water) goes on until a uniform
mixture is formed.
(c) This process is dissolution/diffusion as potassium
permanganate crystal is dissolved in water.
(d) This process is evaporation as acetone evaporates when
kept open in the bottle.
(e) This process is centrifugation. Milk is put in a
closed container in big centrifuge machine. When machine is switched on, milk
is rotated at a very high speed.
Due to this, milk separates into 'cream' and 'skimmed
milk'. The cream being lighter, floats over the skimmed milk and then can be
removed.
(f) This process is sedimentation as sand does not
dissolve completely in water and forms suspension and settles down at the
bottom when left undisturbed for some time.
(g) This shows Tyndall effect, i.e., scattering of light
by colloidal solution or by particles in a fine suspension. Dust particles are suspended
in air which scatter the light coming from small hole.
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