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

Q:

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?

A:

We should add ice to the lemonade after dissolving sugar.

More sugar can be dissolved before adding ice to the lemonade. This is because sugar dissolves very slowly in cold water.

Q:

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.

A:

(a) A mixture of milk and water can be separated by filtration.      (False)

(b) A mixture of powdered salt and sugar can be separated by the process of winnowing. (False)

(c) Separation sugar from tea can be done with filtration.     (False)

(d) Grain and husk can be separated with the process of decantation. (False)

Q:

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 the top. The process of separation used in this example is called ________.

A:

(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 the top. The process of separation used in this example is called decantation.

Q:

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

A:

Clear water from the sample of muddy water can be obtained by the process of filtration. Muddy water is allowed to pass through muslin cloth or filter paper. Water passes through the muslin cloth and mud particles remain on the muslin cloth.

Q:

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

A:

Yes, it is possible to separate sugar from wheat flour. Mixture of sugar and wheat flour is allowed to pass through sieve. Wheat flour particles being fine pass through the holes of sieve and sugar remains on the sieve.

Q:

What is winnowing? Where is it used?

A:

Winnowing is a process of separating heavier and lighter components of a mixture by wind or by blowing air. This method is based on the property that grains are heavier than husk and hay.

Farmers use this method to separate grains from husk and hay.

Q:

How will you separate sand and water from their mixture?

A:

Mixture of sand and water can be separated by two methods:

1) Combination of sedimentation and decantation

2) Filtration

1) Combination of sedimentation and decantation: Take the mixture of sand and water in a container and allow the mixture to stand for some time. Sand particles being heavier settle down at the bottom. This process is called sedimentation. Water is poured out into another container without disturbing sand. This process is called decantation.

2) Filtration: Mixture of sand and water is allowed to pass through a strainer or muslin cloth. Water goes through strainer and sand remains on the strainer.

Q:

What is sieving? Where is it used?

A:

Sieving is the process of separating solid components of a mixture varying in size. In this process, sieves with holes of proper size is used. Sieving allows the fine particles to pass through the holes of sieves, leaving behind the bigger particles on the sieve.

Husk and stones from wheat are separated by sieving.

Q:

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

A:

Husk or dirt particles from the given sample of pulses can be separated by sedimentation. In this process, water is added to the pulses. Pulses being heavier settle down at the bottom and the impurities like husk and dust particles go into water. Water along with dust particles is removed by the process of decantation, leaving the pulses at the bottom.

Q:

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

A:

Different components of a mixture are separated either to separate undesired components, impurities or to obtain more than one useful components from the mixture.

Examples:

1) Small stone pieces and unwanted seed grains are removed from rice or dal before cooking.

2) From petroleum useful components like petrol, diesel kerosene, etc. are separated.

Benefits of NCERT Solutions

Following are some of the benefits of using NCERT Solutions by Extramarks.

1. They are developed by our experts with the right approach for precisely answering the textbook questions.

2. They are free of cost and available online to help class 6 students.

3. They not only explain every topic but also prepare students for further examinations. 

4. They are proven to be helpful to students in their exam preparation, homework and competitive exams.

5. They will help in understanding the solutions and the methodology of writing the answers in the exams.

Tips & Strategies for Class 6 Exam Preparation

1. Make a habit of making notes for your exam preparation.

2. Study class 6 solutions from Extramarks website.

3. Learn from the best teachers with Extramarks and clear your doubts instantly.

4. While practicing, refer to NCERT Solutions for class 6 to understand step-by-step solutions to all questions.

5. Get concept clarity by tuning in to the Extramarks live classes.
6. Make time for relaxation and sleep well.

Why opt for Extramarks NCERT Class 6 Solutions?

NCERT Solutions for class 6 by Extramarks are designed by subject matter experts and provide solutions to every NCERT textbook questions. These solutions help students in their exam preparation and home assignments. Extramarks Education aims to help class 6 students understand concepts in a comprehensive way so that their base is strong for senior classes. We provide free NCERT Solutions for class 6 and all other classes.

Frequently Asked Questions

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Whenever you are stuck solving a question, have doubts or maybe want a step-by-step solution to any question from the textbook- refer to NCERT Solutions class 6 all subjects by Extramarks. It is proven for helping students learn better and improve their exams in class 6.

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NCERT Solutions for class 6 allow students to understand concepts in a simplified manner, and are an irreplaceable support to them. They not only explain every step but also prepare students for further exams. Maths of class 6 is important as a student must understand every concept if he/ she wants to learn maths in senior classes. Hence, NCERT Solutions for class 6 Mathematics is a complete study material and a must-have for every student.

Why are the NCERT solutions Important for Class 6th?

NCERT Solutions for Class 6 Science, Mathematics and other subjects are important as it is the foundation of concepts and formulas. Once you will understand the basic, you will be able to solve complex problems much easily. It also helps to solve your doubts systematically as they are self-explanatory and provide comprehensive solutions to all students.

Do you provide solutions for all subjects for class 6 CBSE?

Yes, the Extramarks website is your one-stop solution for everything you need while studying. Not just class 6 NCERT Solutions, but we also provide solutions for all other classes. 

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