Question

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Answer 1

Answer:

a)Sedimentation and decantation.

b)Sedimentation and decantation methods are used for the separation of insoluble substances which are heavier than liquid. In the sedimentation process, heavier components of the mixture settle on the bottom, due to gravity. Decantation follows sedimentation.

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Answer 2

(a) Sedimentation and Decantation is the proceses shown in the figure .

(b) Sedimentation : The process of setting down of heavier insoluble particles from mixture is called sedimentation.

Decantation : The process of transferring the clear and clean liquid with out disturbing the sediments is called Decantation.

Example : This method can be used to purify impure water.

Sedimentation

It is defined as the separation process in which solids are separated from the liquid. All the solids settle down at the bottom of a beaker and on top, a clear layer of liquid is obtained. Sedimentation is a process by which heavier impurities present in liquid normally water settle down at the bottom of the container containing the mixture. The process takes some amount of time.

Example

Water treatment plants use the method of sedimentation to filter out unwanted particles from unclean water.

Decantation

It is defined as the separation process in which two immiscible liquids are separated. This is done by pouring out the clear upper layer of liquid. Separation of a mixture of oil from water is an example of decantation.

Example

This process can also be used to separate two liquids that do not mix e.g., oil and water. When we leave the mixture of oil and water, two separate layers are formed, with water at the bottom and oil, being lighter, at the top. We can remove the oil layer from the top by pouring it into another vessel, which leaves us with the water layer at the bottom.

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