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Class 6 Science Chapter 6 Separation of Substances
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Separation of Substances
Chapter: 6
PART – I
EXERCISE
1. Darken the circle of the correct answer.
(i) Which of the following mixtures can be separated by hand picking?
(a) Common salt and sand.
(b) Saw dust and iron filings.
(c) Rice grain and stone.
(d) Camphor and sand.
Ans: (c) Rice grain and stone.
(ii) Which method is used when we wash pulses to clean?
(a) Threshing.
(b) Handpicking.
(c) Sieving.
(d) Decantation.
Ans: (d) Decantation.
(iii) Which method is used for separating a mixture of iron and coal dust”?
(a) Evaporation.
(b) Threshing.
(c) Magnetic separation.
(d) Decantation.
Ans: (c) Magnetic separation.
(iv) Which method is used to separate tea leaves from tea?
(a) Threshing.
(b) Handpicking.
(c) Sieving.
(d) Filtration.
Ans: (d) Filtration.
2. Match the following:
| (a) Separation of mud in water | (i) Magnetic separation |
| (b) Alum mixed in muddy water | (ii) Winnowing |
| (c) Revolving a mixture at high speed | (iii) Filtration followed by evaporation |
| (d) Groundnut oil and water | (iv) Filtration |
| (e) Sand and iron filings | (v) Chuming |
| (f) Common salt dissolved in water | (vi) Decantation |
| (g) Husk from paddy seed | (vii) Evaporation |
Ans:
| (a) Separation of mud in water | (vi) Decantation |
| (b) Alum mixed in muddy water | (iv) Filtration |
| (c) Revolving a mixture at high speed | (v) Chuming |
| (d) Groundnut oil and water | (vii) Evaporation |
| (e) Sand and iron filings | (i) Magnetic separation |
| (f) Common salt dissolved in water | (iii) Filtration followed by evaporation |
| (g) Husk from paddy seed | (ii) Winnowing |
3. Fill in the blanks.
(a) __________ method is used to separate iron filing from heap of garbage.
Ans: Magnetic separation.
(b) Two immiscible liquids can be separated with the help of __________ method.
Ans: Decantation.
(c) Flour and bran can be separated by _____________ method.
Ans: Sieving.
(d) __________ method is used to separate wheat from straw.
Ans: Winnowing.
(e) During filtration of sand-water mixture, water particles pass though the holes of the filter paper because water particles are ________and ________ sand particles are _________.
Ans: Small and soluble, large.
4. Answer the following questions:
(a) How will you separate a mixture of salt and sand?
Ans: To separate salt and sand, add water to dissolve the salt. Filter the mixture to separate the sand. Then, evaporate the filtrate to obtain salt.
(b) Suggest a method to separate a mixture of coconut oil and water.
Ans: Decantation method is used to separate a mixture of coconut oil and water.
(c) How will you separate salt from salt solution?
Ans: Salt in water can be separated by boiling salt water until the whole amount of water is evaporated.The salt will remain in the container as the water evaporates.
5. In the following mixtures which property can be used for the separation of their components”?
(a) Salt and chalk powder.
Ans: Solubility (dissolve salt in water and filter out chalk).
(b) Rice and straw.
Ans: Winnowing.
(c) Chalk and coal.
Ans: Handpicking.
(d) Iron filings and sawdust.
Ans: Magnetic separation
(e) Sand and rice grain.
Ans: Sieving.
6. How do we obtain salt from sea water?
Ans: Firstly, it is extracted from sea water. Sea water contains many other substances along with Obtaining salt from sea water common salt. When sea water is allowed to stand in shallow pits, water slowly evaporates. After a few days, the water evaporates completely leaving behind the common salt mixed with some other substances.Common salt is then obtained from this mixture through a process called purification.
7. What is the criterion for selection of methods to separate the components from a mixture?
Ans: The selection criterion depends on the physical properties of the components, such as size, shape, weight, magnetic property, solubility, and whether the components are solid, liquid, or gas.
8. Write all the possible methods used to purify muddy river water to obtain clear water.
Ans: (i) Sedimentation: Letting mud settle at the bottom.
(ii) Decantation: Pouring off clear water from the top.
(iii) Filtration: Using a filter to remove fine particles.
(iv) Boiling: To kill microorganisms.
(v) Chlorination: Adding chlorine to disinfect.
9. Explain filtration with the help of diagram.
Ans: Filtration is a process used to separate insoluble solid particles from a liquid by passing the mixture through a filter medium, such as filter paper.
10. In activity 6.2 in this chapter, name the method of separation aplicable for all the possible mixtures listed.
| S.I No. | Two substances taken | Their physical state | Soluble/ insoluble | Method of Separation |
| 1 | Salt,Water | Solid, liquid | soluble | Evaporation |
| 2 | ||||
| 3 |
Ans:
| S.I No. | Two substances taken | Their physical state | Soluble/ insoluble | Method of Separation |
| 1 | Salt, Water | Solid, liquid | soluble | Evaporation |
| 2 | Oil, Water | Liquid ,liquid | insoluble | Decantation |
| 3 | Sand, Water | Solid, Liquid | insoluble | Sedimentation |
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