NCERT Solutions for Class 6 Science Chapter 5 Separation of Substances

NCERT Solutions for Class 6 Science Chapter 5 Separation of Substances teaches you to solve different kinds of questions that can be asked on the topic included in methods of separation of substances. These NCERT Solutions are available in PDF format for easy access and download. This study material is important for your CBSE Class 6 examination. In order to score good marks, we recommend studying the solution thoroughly.

NCERT Solutions for Class 6 Science is a crucial study source which will help you clear all the doubts that occur while studying the CBSE syllabus Chapter 5 of Class 6 Science. Fill in the blanks, True or false questions, long answer questions and practical based questions and their answers will help you clear the concepts, which are significant from the standpoint of your future studies.

This Chapter introduces you to methods of separation such as hand-picking, winnowing, threshing, sieving, sedimentation, decantation, filtration and evaporation. This Chapter will make you understand the process of separation by using real-life examples, such as separating husk and stones from grains, separation of solids from liquids etc.

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Exercise Questions

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

Solution:

When two or more substances are mixed together they form a mixture. Components of a mixture should be separated because some components may not be useful or may spoil the useful component of the mixture.

Examples:

Tea leaves are separated from the liquid with a strainer, while preparing tea

Removal of stone pieces from wheat, rice or pulses by hand

2. What is winnowing? Where is it used?

Solution:

The method of separating the components from a mixture is known as winnowing. In this method, heavier and lighter components of a mixture are separated by wind or by blowing air. This method is used by farmers to separate lighter husk particles from heavier seeds of  grain.

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

Solution:

Husk and dirt particles are separated from pulses by winnowing.

4. What is sieving? Where is it used?

Solution:

Sieving is a method in which fine particles are sieved through holes of the sieve while the bigger impurities remain on the sieve. Sieving is used in a flour mill to separate impurities like husk and stones from wheat before grinding it. It is also used at construction sites to separate pebbles and stones from sand.

5. How will you separate sand and water from their mixture?

Solution:

Sand and water are separated from their mixture by the following steps:

a) The mixture is allowed to stand without any disturbances

b) Now sand settles down

c) Slowly pour the water into another container to obtain sand in the bottom

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

Solution:

Yes it is possible to separate sugar mixed with wheat flour by the following method

a) Mix sugar and wheat flour in water

b) Stir the solution to allow sugar to dissolve

c) Now filter the mixture

d) Filtrate contains sugar solution and residue will be wheat flour.

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

Solution:

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

ii) Slowly pour water to another container

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 ___________.

Solution:

(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.

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.

Solution:

a) False

b) False

c) False

d) False

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?

Solution:

Ice should be added to lemonade after dissolving sugar. It is possible to add more sugar before adding ice.

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NCERT Solutions for Class 6 Science Chapter 5 Separation of Substances: Important topics

• Methods of separation
• Hand-picking
• Winnowing
• Threshing
• Sieving
• Sedimentation, Decantation and Filtration
• Evaporation
• Use of more than one method of separation
• Can water dissolve any amount of a substance?