Methods of Separation in Everyday Life Class 6 Question Answer Science Chapter 9

Methods of Separation in Everyday Life Class 6 Questions and Answers NCERT Solutions

Class 6 Science Chapter 9 Methods of Separation in Everyday Life Question Answer

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Question 1.
What purpose does handpicking serve in the process of separation?
(i) Filtration
(ii) Sorting
(iii) Evaporation
(iv) Decantation
Answer:
(ii) Sorting

Question 2.
Which of the following substances are commonly separated using the churning method?
(i) Oil from water
(iii) Cream from milk
(ii) Sand from water
(iv) Oxygen from air
Answer:
(iii) Cream from milk

Question 3.
Which factor is usually essential for the filtration?
(i) Apparatus size
(ii) Presence of air
(iii) Pore size
(iv) Temperature of the mixture
Answer:
(iii) Pore size

Question 4.
State with reason (s) whether the following statements are True [T] or False [F]. Also, correct the False statement(s).
(i) Salt can be separated from salt solution by keeping it under the Sun. [ ]
(ii) Handpicking should be used only when the quantity of one’component is less. [ ]
(iii) A mixture of puffed rice and rice grains can be separated by threshing. [ ]
(iv) A mixture of mustard oil and lemon water can be separated by decantation. [ ]
(v) Sieving is used to separate a mixture of rice flour and water. [ ]
Answer:
(i) [True] : Salt can be separated from salt solution by keeping it under the Sun by the process of evaporation.
(ii) [True] : Handpicking should be used only when the quantity of one component is less.
(iii) [False] : A mixture of puffed rice and rice grains can be separated by threshing.
Corrected statement A mixture of puffed rice and rice grains can be separated by winnowing.
(iv) [True] : A mixture of mustard oil and lemon water can be separated by decantation. As mustard oil is insoluble in lemon water and forms a separate layer after getting mixed.
(v) [False] : Sieving is used to separate a mixture of rice flour and water.
Corrected statement Sieving is used to separate solid-solid mixture of different sizes and not for separating solid from liquid. A mixture of rice flour and water can be separated by filtration or decantation.

Question 5.
Match the mixtures in Column I with their method of separation in Column II.

Answer:

Column I	Column II
(i) Gram flour mixed with black gram	(d) Sieving
(ii) Chalk powder mixed with water	(e) Filtration
(iii) Corn mixed with potatoes	(a) Handpicking
(iv) Iron powder mixed with sawdust	(b) Magnetic separation
(v) Oil mixed with water	(c) Decantation

Question 6.
In what situations would you use decantation instead of filtration to separate solids from liquids?
Answer:
Decantation method is used when the insoluble solid particles are heavier and settle down at the bottom of the vessel. The liquid is separated from insoluble solids by pouring off the liquid while leaving the solid particles behind as a residue.
While filtration method is used when insoluble particles do not settle down and spreads throughout the solution.

Question 7.
Can you relate the presence of nasal hair to any separation process?
Answer:
Nasal hair traps the dust and otherimpurities from the air and prevent their entry inside our body while breathing. So, nasal hair acts as a natural filter for the air we breathe.

Question 8.
During the COVID-19 pandemic, all of us wore masks. Generally, what material are they made of ? What is the role of these masks?
Answer:
Masks are generally made up of multiple layers of materials, like cotton, polyester etc. Masks are used to filters out dust, viruses and other harmful particles from the air we breathe.

Question 9.
A mixture containing potatoes, salt and sawdust has been given to you. Outline a stepwise procedure for separating each component from this mixture.
Answer:
A mixture containing potatoes, salt and sawdust can be separated by using following steps:
(a) Separating the potatoes from the mixture by hand-picking method.
(b) Adding water to the remaining mixture to make a solution, as salt dissolves in water while sawdust remains insoluble in water.
(c) Filter the mixture using a filter paper to separate sawdust from the solution of salt in water.
(d) Evaporate the water from the salt solution to get the salt.

Question 10.
Read the following story titled ‘Intelligent Leela’ and tick the most appropriate options. Provide a suitable title of your choice for the paragraph.
Leela was working in the farm with her father when she realised that they left their drinking water at home. Before her father felt thirsty/hungry, she went to the nearby pond to fetch some water/grains. After obtaining some water in the container, she noticed that the water was muddy and fit/unfit for drinking. To purify the water, she kept it for some time and then she filtered/ churned the muddy water using a piece of paper/musilin cloth. Leela, then, cooled/boiled the water for about 10 minutes in a covered pan. After cooling/boiling, she filtered/churned it again and made it fit/unfit for drinking. She served this water to her father while having food, who blessed her and appreciated her efforts.
Answer:
Title of the paragraph Leela’s Method of Water Purification
Leela was working in the farm with her father when she realised that they left their drinking water at home. Before her father felt thirsty, she went to the nearby pond to fetch some water. After obtaining some water in the container, she noticed that the water was muddy and unfit for drinking. To purify the water, she kept it for some time and then she filtered the muddy water using a piece of muslin cloth. Leela, then, boiled the water for about 10 minutes in a covered pan. After boiling, she filtered it again and made it fit for drinking. She served this water to her father while having food, who blessed her and appreciated her efforts.

NCERT Solutions for Class 6 Science Chapter 9 Methods of Separation in Everyday Life

Intext Questions

Question 1.
A small amount of puffed rice is mixed with chana dal. Can you think of separating the mixture by any method other than handpicking? (Page 165)
Answer:
Yes, the other method is winnowing.

Question 2.
Valli is unable to separate husk from rice in a closed room. How can you help her? (Page 166)
Answer:
Valli cannot separate husk from rice in a closed room. She should go in an open windy place or put a fan in the room. She can now separate them by using winnowing method, which causes separation of heavier and lighter components of a mixture by wind or by blowing air.

Question 3.
Have you ever observed sieves being used at construction sites to separate pebbles and stones from the sand? (Page 167)
Answer:
Yes, slanting sieves are used at construction sites to separate pebbles and stones from the sand.

Question 4.
Have you ever observed white patches on the dark coloured clothes you wear during hot summers? How are these patches formed? (Page 168)
Answer:
Sweat contains salts and water. During hot summers, the water of sweat evaporates, and leaves behind the salts which appear as white patches on the dark coloured clothes.

Question 5.
Is there any method through which I can get back both salt and water. Observe the figure.

Does it answer the question? Can you name the process involved. (Page 169)
Answer:
Yes, it answer the question. The process involved is condensation.

Question 6.
In the chapter ‘Materials Around Us’, you have studied that oil does not mix with water and forms a separate layer when left undisturbed for some time. Which method of separation would you use to separate oil and water? (Page 170)
Answer:
Decantation method is used for separating two immiscible liquids, like oil and water as they do not mix with each other and forms a separate layer due to difference in weight. So, these two layers can be separated very easily through decantation, by pouring the top layer (oil) in another beaker or container, leaving behind the lower layer (water).

Question 7.
Can you name one kitchen appliance which runs on electricity that is used to prepare buttermilk? (Page 174)
Answer:
Electric mixer is used to prepare buttermilk.

Let’s Investigate

Activity 1 (Page 165)

Aim : To separate the roasted peanuts from the peanut skins.
Materials Required Roasted peanuts.

Procedure :

1. Take a handful of roasted peanuts.
2. Rub these roasted peanuts between your palms.
3. Trying blowing the mixture in your hands.

Observation : After rubbing, the peanuts skin get removed from peanuts. While blowing, removed peanut skins, being lighter, gets blown away from the mixture thus, we get peanuts (heavier) left in gur hands.

Conclusion : We can conclude that the roasted peanuts can be separated from the peanut skins by using the process of winnowing. It means the blowing air separates the heavier and the lighter components.

Viva Questions :

1. What is the main purpose of the method of separation used in this activity?
2. How can you separate husk from rice grains?

Activity 2 (Page 168)

Aim To separate salt from salt-water solution.
Materials Required A container, 2-3 teaspoons of salt, stirring rod, black or dark coloured thick paper.

Procedure :

1. Take a container and fill it half with water.
2. Add 2-3 teaspoons of salt into it and stirr it using stirring rod till the salt dissolves to form a solution.
3. Spread a few drops of the salt solution on the small piece of black or dark coloured thick paper by making any random art.
4. Allow it to dry for some time till all the water get evaporated from the thick paper.

Observation : After some time, white patches on the thick paper is observed and the presence of salt in the form of white powder is felt.

Conclusion : Salt gets separated from the salt-water solution through the process of evaporation.

Viva Questions :

1. What will happen when we add sugar instead of salt?
2. Why is white patches formed on the thick paper?

Activity 3 (Page 169)

Aim : To separate salt from salt-water solution by evaporation.
Materials Required Salt, water, teaspoon, bowl, china dish, spirit lamp, tripod stand and wire gauze.

Procedure :

1. Take a teaspoon of salt and mix it with water to make salt solution in a bowl.
2. Take some salt solution in a china dish.
3. Heat the solution and let the water to completely boil as shown in the figure.
4. Then, allow the china dish to cool.

Observation After complete vapourisation, there is a white residue, salt is left behind in the china dish.
Conclusion We can conclude that salt (solid substance) which is soluble in water (liquid) can be separated out through the process called evaporation.

Viva Questions :

1. Can we also evaporate water in the presence of the sun?
2. Do we get pure salt from evaporation?

Activity 4 (Page 171-172)

Aim : To separate clear water from muddy water by using the process of filtration.
Materials Required Muddy water, filter paper, funnel, 2 glasses etc.

Procedure :

1. Fold the filter paper into a cone and place it inside the funnel, which is kept on an empty glass.
2. Pour half a glass of muddy water into the funnel.

Observation : Solid particles or mud in the mixture do not pass through funnel and remain on the filter paper as residue and the liquid passes through the filter paper and gets collected in the glass.

Conclusion : We can conclude that the given muddy water can be turned to clear water by using the process of filtration.

Viva Questions :

1. Name other examples of mixtures which can be separated by this activity.
2. What is the purpose of filter paper?

Do It yourself (DIY)

I. Aim To separate sand, salt and water present in a mixture.
II. Aim To separate sand and pebbles by the process of sieving.

Curiosity Class 6 Science Book Solutions