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NCERT Class 6 Science Chapter 9 Methods of Separation in Everyday Life
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Methods of Separation in Everyday Life
Chapter: 9
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1. What purpose does handpicking serve in the process of separation?
(i) Filtration.
(ii) Sorting.
(iii) Evaporation.
(iv) Decantation.
Ans: (ii) Sorting.
2. Which of the following substances are commonly separated using the churning method?
(i) Oil from water.
(ii) Sand from water.
(iii) Cream from milk.
(iv) Oxygen from air.
Ans: (iii) Cream from milk.
3. Which factor is usually essential for the filtration?
(i) Apparatus size.
(ii) Presence of air.
(iii) Pore size.
(iv) Temperature of the mixture.
Ans: (iii) Pore size.
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. [ ]
Ans: True.
Reason: The water will evaporate leaving the salt behind.
(ii) Handpicking should be used only when the quantity of one component is less. [ ]
Ans: True.
Reason: It is easier to handpick small quantities.
(iii) A mixture of puffed rice and rice grains can be separated by threshing. [ ]
Ans: False
Reason: The Process of threshing is used to separate the grains from the stalks.
Correct statement: This mixture can be separated by handpicking or winnowing.
(iv) A mixture of mustard oil and lemon water can be separated by decantation. [ ]
Ans: True.
Reason: The oil and water will form separate layers which can be decanted.
(v) Sieving is used to separate a mixture of rice flour and water. [ ]
Ans: False.
Reason: Sieving is done to separate solid-solid mixture of different particle sizes.
Correct Statement: Filtration is used to separate a mixture of rice flour and water.
5. Match the mixtures in Column Ⅰ with their method of separation in Column ⅠⅠ.
| Column Ⅰ | Column ⅠⅠ |
| (i) Gram flour mixed with black gram | (a) Handpicking |
| (ii) Chalk powder mixed with water | (b) Magnetic separation |
| (iii) Corn mixed with potatoes | (c) Decantation |
| (iv) Iron powder mixed with sawdust | (d) Sieving |
| (v) Oil mixed with water | (e) Filtration |
Ans:
| 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 |
6. In what situations would you use decantation instead of filtration to separate solids from liquids?
Ans: Decantation is used when the solid particles are heavy and settle down at the bottom of the container, allowing the clear liquid to be poured off without disturbing the solid sediment. For example, separating sand from water.
7. Can you relate the presence of nasal hair to any separation process?
Ans: Yes, nasal hair acts like a filter. It traps dust particles, pollutants, and other impurities from the air, much like filtration in a separation process where solid particles are separated from a liquid or gas.
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?
Ans: Masks are generally made of multiple layers of fabric or materials such as cotton, polypropylene, or polyester. Their role is to filter out harmful particles, including viruses, from the air we breathe, similar to how filtration processes work to remove impurities from liquids.
9. A mixture containing potatoes, salt and sawdust has been given to you. Outline a stepwise procedure for separating each component from this mixture.
Ans: (i) Use handpicking to remove the potatoes from the mixture, as they are large and can be easily separated manually.
(ii) Add water to the remaining mixture of salt and sawdust. The sawdust will float on the surface, while the salt will dissolve in the water.
(iii) Use filtration to separate the floating sawdust from the saltwater solution.
(iv) To separate the salt from the water, use evaporation: Heat the saltwater solution to evaporate the water, leaving behind the salt.
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/muslin 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.
Ans: Title: Leela’s Clever Solution:
The correct options are:
(i) Thirsty.
(ii) Water.
(iii) Unfit.
(iv) Filtered.
(v) Muslin cloth.
(vi) Boiled.
(vii) Filtered.
(vii) Fit.
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