ort Answer Type Questions
(3 Mark
(a) Why is crystation technique better th
simple evaporation
(b) Why is a fractionating cola with beads used
fractional distillation process
c) Name the technique used for separating cre
from milk.
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(a) Crystallization is a process that separate a pure solid in the form of its crystal from a solution. Crystallization is better than evaporation because during evaporation some solid decompose or some like sugar may get charged on heating to dryness.
(b) Fractionating column is the most important part of the fractional distillation apparatus. This column is provided with some glass beads in it. Separation of miscible liquids by fractional distillation - It helps to obstruct the upward movement of the vapours of the two liquids.
(c) The process of centrifugation is used to separate cream from milk - When the centrifuge machine is switched on, the milk is rotated (or spun) at a very high speed in its container
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