NCERT solutions for class 6 science chapter 5:Separation of substance

Discover our detailed NCERT Solutions for Class 6 Science Chapter 5: Separation of Substances. This resource covers various methods used to separate mixtures, including filtration, evaporation, and distillation. Our clear explanations and step-by-step answers help students understand the importance of separation techniques in daily life and science experiments. Ideal for exam preparation and classroom reinforcement, these solutions enhance students’ understanding of material properties and their applications.

Exercise Question

Question 1:

Why do we need to separate different components of a mixture? Give two examples.

Answer 1

When two or more substances are mixed together they form a mixture. Among different components of mixture there are many substances which are harmful or not useful for us. To remove these harmful we need to separate them. For example:
(a) Tea leaves are separated from the liquid with a strainer while preparing tea.
(b)Evaporation removes a liquid from a solution to leave a solid material.
(c)Filtration separates solids of different sizes

Qquestion 2:

What is winnowing? Where is it used?

Answer 2:

The process of separating heavier and lighter components of a mixture by wind is called winnowing. This method is used by farmers to separate lighter husk particles from heavier seeds of grain. In this method, heavier and lighter components of a mixture are separated by wind.

Question 3:

How will you separate husk or dirt particles from a given sample of pulses before cooking?

Answer 3:

By the process of handpicking we can separated Husk and dirt particles from pulses .

Question 4:

What is sieving? Where is it used?

Answer 4:

Difference in the size of particles in a mixture is utilised to separate them by the process of sieving and filtration. Sieving is used in a flour mill to separate impurities like husk and stones from wheat before grinding it.

Question 5:

How will you separate sand and water from their mixture?

Answer 5:

In a mixture of sand and water,The mixture is allowed to stand without any disturbances. The heavier sand particles settle down at the bottom by the process of sedimentation and the water can be separated by decantation. Filtration can be used to separate components of a mixture of an insoluble solid and a liquid.

Question 6:

Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it?

Answer 6:

Yes it is possible to separate sugar mixed with wheat flour by the process of sieving

Question 7:

How would you obtain clear water from a sample of muddy water?

Answer 7:

The following process should be carried out to obtain clear water from muddy water i) Allow muddy water to stand
ii) Mud gets settled down in the water
(iii) Upper layer is clean water
(iV) Slowly pour water to another container

Question 8:

Fill up the blanks
(a) The method of separating seeds of paddy from its stalks is called ___________.
(b) When milk, cooled after boiling, is poured onto a piece of cloth the cream (malai) is left behind on it. This process of separating cream from milk is an example of ___________.
(c) Salt is obtained from seawater by the process of ___________.
(d) Impurities settled at the bottom when muddy water was kept overnight in a bucket. The clear water was then poured off from the top. The process of separation used in this example is called ___________.

Answer 8:

(a) The method of separating seeds of paddy from its stalks is called threshing.
(b) When milk cooled after boiling is poured onto a piece of cloth, the cream (malai) is left behind on it. This process of separating cream from milk is an example of filtration.
(c) Salt is obtained from seawater by the process of evaporation.
(d) Impurities settled at the bottom when muddy water was kept overnight in a bucket. The clear water was then poured off from the top. The process of separation used in this example is called decantation.

Question 9:

True or false?
(a) A mixture of milk and water can be separated by filtration.
(b) A mixture of powdered salt and sugar can be separated by the process of winnowing
(c) Separation of sugar from tea can be done with filtration.
(d) Grain and husk can be separated with the process of decantation.br>

Answer 9:

Question 10:

Lemonade is prepared by mixing lemon juice and sugar in water. You wish to add ice to cool it. Should you add ice to the lemonade before or after dissolving sugar? In which case would it be possible to dissolve more sugar?

Answer 10:

Lemonade is prepared by mixing lemon juice and sugar in water. You wish to add ice to cool it. Should you add ice to the lemonade before or after dissolving sugar? In which case would it be possible to dissolve more sugar?

Our NCERT Solutions for Class 6 Science Chapter 5 provide valuable insights into the techniques used for separating substances. Explore further chapters and resources on our website to deepen your knowledge of science and support your academic success.