After separation of substances in class 6 MCQ, we attempt now an extra question of this chapter. Separation of Substances class 6 extra questions answers will help you to extra and deep information about this chapter and concept. In these extra questions, we will try to cover all topics of this chapter. Let’s start:-

Q.1: Explain the handpicking method of separation.

Ans. In this process, the separation of substances from a mixture or solution is done by hand. For example, separation of stone or similar substance from pules or rice by our hand. This is an example of handpicking separation. The handpicking method is used for the separation of slightly large mixtures.

Q.2: Explain the threshing method of separation.

Ans. We will try to understand this method by an example. We see many agricultural lands around us. After crop harvesting, the crop will dry in sunlight. Then a lot of grains are present in one single plant of crop. This is very difficult to separate the grains from the crop. So that why to separate the grain we will beat the bundle of crop plant by stone or any hard thing to remove the grains from plants. This process of separation of grains from crop plant bundles is called threshing. Bullock and machines are also used for threshing.

Q.3: Explain the Winnowing method of separation.

Ans. Winnowing is the process of separating heavier and lighter weight mixtures by using wind. This process is also easy to understand by an example. From the example of threshing, after threshing we collect the grains on a plate. Then, if we see carefully, there are some dust and dry leaves present in the grains. Now the question is, how can we separate from it? Turn on the wind blower (not the roof fan) and pick the plate that contains the grain and dust mixture above the height of our body. Now put slowly the mixture in front of the wind, and then we notice the grains are put down and dust and leaves are thrown away from the grains. All the process is called winnowing.

Q.4: Explain the sieving method of separation.

Ans. This method is used to separate the substances by using a sieve or any material like a sieve. For example, if we want to make any dish from flour, then we use a sieve and pour the flour. Then we see the flour pass through it, and some small impurities are not passed. This process is called sieving.

Sieving is used only when a mixture is made from different-sized substances.

Q.5: Explain the sedimentation method of separation.

Ans. When the mixture is made from the same-size substance or a small or micro-sized substance that is not able to be separated by easy method. Then, if we add water to the mixture, after adding water, the heavier nature substance gets down after some time of adding water. This complete process is called sedimentation. For example, take some rice with dust or dry leaves. Now it is too hard to remove the dust completely by hand; we have to add some water to this mixture. After adding water, rice gets down in the pot, and dust will not get down. This process of separation is called sedimentation.

Q.6. Explain the decantation method of separation.

Ans. After the complete process of sedimentation, the removal of water with impurities is called decantation.

Q.7. Explain the filtration method of separation.

Ans. Let’s understand this method by giving examples. When we make tea, we have to separate tea leaf from tea. By using sedimentation and decantation, can we separate completely? The answer is no. For complete separation, we have to pour it. For pour, we use a Stainer, and the separation is complete. This complete process is called filtration.

Passes the solution mixture from a substance that has small/micro/nano holes for separation is called filtration.