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Separation of Components of a Mixture

18 a. Select ...

Question

18 (a). Select a suitable word from those given and write it in the space provided:
sieving, winnowing, loading, evaporation, decantation, filtration, condensation, distillation, sedimentation, sublimation
After pounding, rice is separated from its husk by _________.

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Solution

Winnowing is the method in which heavier components of the mixture are separated from the lighter substances with the help of wind.
The heavier particle (rice grains) forms a separate heap as it falls vertically downward.
This method is used for separating grains from husk after the process of threshing.
Hence, after pounding, rice is separated from its husk by winnowing.

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Q. Select a suitable word from those given and write it in the space provided:
sieving, winnowing, loading, evaporation, decantation, filtration, condensation, distillation, sedimentation, sublimation
(a) After pounding, rice is separated from its husk by ______________ .
(b) A mixture of stones is allowed to fall through wire nets in order to separate them according to different sizes. This is a process of ______________ .
(c) When muddy water is kept overnight in a bucket, the clear water can be poured off from the top, next morning. This is a process of ________________ .
(d) Chilled milk is poured through a muslin cloth to remove the layer of cream. This is a process of _____________ .
(e) Salt is obtained from sea water by _____________ .
(f) Solid iodine can be separated from sand by ____________ .
(g) _____________ is used to separate immiscible liquids.
(h) The process of settling down of heavy solid particles at the bottom of a container coantaining a mixture of a liquid and an insoluble solid is _______________ .

Q. Which of these methods will you use to obtain both the solid and the liquid from a solution?
(a) decantation and filtration
(b) evaporation
(c) distillation
(d) separating funnel

Which of these methods will you use to obtain both the solid and the liquid from a solution?
(a) separating funnel
(b) evaporation
(c) distillation
(d) decantation and filtration

Q. State whether the following are true or false.
(a) A mixture of milk and water can be separated by filtration.
(b) A mixture of water and oil can be separated by distillation.
(c) Filtration will separate wheat from husk
(d) Camphor and sand are mixed together. By heating, camphor will sublime and the vapours can be collected. This will leave behind sand.
(e) A mixture of naphthalene and chalk powder has the smell of naphthalene.
(f) A mixture of tamarind and sugar will taste both sweet and sour.
(g) The process of loading results in better sedimentation.
(h) Sieving is the best method to separate jeera seeds form its stalk.

18 (e). Select a suitable word from those given and write it in the space provided:

sieving, winnowing, loading, evaporation, decantation, filtration, condensation, distillation, sedimentation, sublimation

Salt is obtained from sea water by _________.

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