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Lakhmir Singh Solutions for Class 6 Science Chapter 5 Separation of Substances - PDF

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Last updated date: 23rd Apr 2024
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Download Class 6 Science Chapter 5 Separation of Substances Lakhmir Singh Solutions Free PDF

Matter is all around us. There are different types of matter present around us. If we observe, we can categorise them into pure and impure substances. Class 6 Science Chapter Separation of Substances explains how we can separate them properly.


To understand this chapter well, refer to the answers to the Class 6 Science Chapter 5 Fill in the Blanks and other fundamental questions. These answers are prepared by the subject experts at Vedantu to assist you in preparing this chapter for the exams.

Access Lakhmir Singh Solutions for Science Class 6 Chapter 5 Separation of Substances

Very Short Answer Type Questions 

1. What substance is used for loading the clay particles suspended in muddy water?

Ans: The chemical agent which is used to load clay particles suspended in muddy water is called alum.


2. What name is given to the pure substances present in a mixture?

Ans: A pure substance is called an element, it cannot be changed into another substance, either physically or chemically. Examples include hydrogen gas, etc. 


3. Which method is used to separate grains from stalks? 

Ans: Threshing is the process of releasing the edible portion of the grain from the straw to which it is attached. Threshers are the machines used for separating wheat, peas, soyabeans, and other grains. 


4. Which method is usually used to separate small pieces of stones from pulses at home?

Ans: Handpicking is one of the very old separation techniques. The idea of the hand-picking method of separation is based on the size of the particles and identification. Examples include separating stones from rice, legumes, and wheat, and other mixtures.


5. Name the method used to separate husk from wheat.

Ans: Winnowing is an agricultural practise that is used to separate grain from chaff. It includes flinging mixtures into the air so that the wind can carry away the lighter chaff while leaving the heavier grains to fall to the ground.


6. Which method is used to separate the components of a mixture which are of different sizes? 

Ans: Given the different sorts of mixtures, filtering is a procedure used to separate solids from liquids or gases. The fluid that goes through the filter is known as filtrate. Examples of filters include scraping charcoal material, sand, and others.


7. Name a device used to separate a mixture of sand and small iron nails. 

Ans: In order to separate sand and tiny iron nails, a magnet is used. The Iron particles get attracted to the magnet leaving the sand particles behind.


8. What type of magnet is fitted on a crane to separate scrap iron objects from a heap of waste materials in factories?

Ans: The type of magnet used on cranes to remove scrap iron objects from piles of waste materials in manufacturers is called an electromagnet. An electromagnet is a device that uses the magnetic effect of electric current to operate. It is created when a powerful magnetic field is generated inside a solenoid.


9. Name the method used in cashewnut factories to separate cashewnuts of different sizes.

Ans: In cashewnut factories, sieving is a technique used to separate cashewnuts of various sizes. A sieve has tiny pores at the bottom. The technique of sieving involves separating particles based on their size. For instance, sieving allows little flour particles to pass through the perforations while larger particles or impurities stay on the sieve.


10. State whether the following statements are true or false: 

  1. The process of winnowing is used to remove small stone particles from wheat. 

  2. A mixture of powdered salt and sugar can be separated by the process of winnowing.

  3. Grain and husk can be separated by the process of decantation. 

  4. Bran is separated from wheat flour by the hand-picking method.

  5. Cream (malai) is separated from milk by sieving. 

  6. A mixture of milk and water can be separated by filtration. 

  7. Separation of sugar from tea can be done by filtration. 

  8. Common salt is separated from its solution in water by decantation.


Ans:

  1. (False)

Threshing is the process used to separate mixtures from the grains.

  1. (False)

Mixture of powdered salt and sugar cannot be separated by the process of winnowing.

  1. (False)

Grain and husk can be separated by the process of winnowing. 

  1. (False)

Bran can be separated from wheat flour by the sieving method.

  1. (False)

A mixture(liquid) can be separated using the centrifugation technique by spinning but not by sieving. 

  1. (False) 

Mixture of milk and water cannot be separated by filtration. 

  1. (True)

Separation of sugar from tea can be done by filtration. 

  1. (False)

Common salt can be separated from its solution in water by evaporation but not by decantation.


11. Name the process by which water is separated from rice and pulses after washing them.

Ans: In order to separate rice and pulses after washing them, decantation is the process employed. The pulses settle down at the bottom of the vessel and the water at the top is drained out.


12. Name the process of obtaining clear Water from muddy river water in which alum is used.

Ans: Water filtration uses filters to remove any quantity of particles, silt, bacteria, and the chlorine taste. Filtration is the process by which constituents of a fluid mixture are separated based on their size. The most typical example is while preparing tea and separating the tea leaves from the water using a filter or sieve.


13. Name one method for separating a mixture of chalk powder and water.

Ans: Filtration is the process by which constituents of a fluid mixture are separated based on their size. Filtration is the method for separating a mixture of chalk powder and water.


14. Name four materials which can be used as 'filters' in the process of filtration.

Ans: Four materials which can be used as 'filters' in the process of filtration are:

  1. Wire- mesh

  2. Strainer

  3. A piece of cotton

  4. Scrap material charcoal

  5. Filter Paper

  6. Soil


15. Name the process used to recover common salt from sea water. 

Ans: Large, shallow pools of seawater are created and let to remain there. The sun's heat eventually evaporates the water, leaving behind common salt, which is then further gathered, cleaned, and packaged for domestic use.

Thus, evaporation is the process used to recover salt from sea water.


16.  Name the process you would use to separate sugar dissolved in water. 

Ans: Evaporation is the process by which a substance changes from a liquid state to a gaseous one below the boiling point; in particular, it is the way in which liquid water becomes water vapour and enters the atmosphere. Using evaporation, we can separate sugar dissolved in water.


17. What method will you use to separate copper sulphate from its solution? 

Ans: The crystals of copper sulphate dissolve in water to generate copper sulphate solution. Evaporation technique is mainly used to separate copper sulphate from copper sulphate solution. In order to extract copper sulphate back, the solution must be heated so that water is then evaporated away leaving behind solid copper sulphate crystals.


18. You are given a salt solution. What method will you use:  

  1. to recover only salt? 

  2. to recover salt as well as water? 

Ans: 

  1. Salt and water combine well to create a clear salt solution. Therefore, evaporation is used to separate salt from water because their respective boiling points are different. In this procedure, water and common salt are mixed in a porcelain dish. The solution is heated until the water in the mixture turns into water vapours. Thus, common salt was extracted from the salt solution through evaporation.

  2. Distillation is a two-step process that involves boiling water to create water vapours or steam and then condensing a hot water vapour back into a liquid state after cooling, respectively. In order to separate salt and water from the salt water mixture, distillation is required.


19. What name is given to the solution in which no more substance can be dissolved at that temperature? 

Ans: The term "saturated solution" refers to a solution containing as much solute that can dissolve at a particular temperature. Due to the presence of intermolecular space between solvent molecules, the solute can dissolve in a solvent in a saturated solution. However, if solute is added continuously, the solvent particles' intermolecular gap is filled and further addition is prevented. As a result, at that temperature, a saturated solution is one in which no additional substance can be dissolved.


20. Fill in the following blanks with suitable words: 

  1. Insects can be separated from wheat by _________.

  2. The method of separating seeds of paddy from stalks is called __________.

  3. Salt is obtained from sea-water by the process of ____________.

  4. The process of heating a liquid to form vapour, and then cooling the vapour to get back liquid is called __________.

  5. When milk, cooled after boiling, is poured on to a piece of cloth, cream (malai) is left behind on it. This process of separating cream from milk is an example of ____________.

  6. Impurities settled at the bottom when muddy water was kept overnight in a bucket. The clear water them poured off from the top. The process of separation used in this example is called _________.

Ans:

  1. Insects can be separated from wheat by hand picking.

  2. The method of separating seeds of paddy from stalks is called threshing.

  3. Salt is obtained from sea-water by the process of evaporation.

  4. The process of heating a liquid to form vapour, and then cooling the vapour to get back liquid is called distillation.

  5. When milk, cooled after boiling, is poured on to a piece of cloth, cream (malai) is left behind on it. This process of separating cream from milk is an example of filtration.

  6. Impurities settled at the bottom when muddy water was kept overnight in a bucket. The clear water them poured off from the top. The process of separation used in this example is called decantation.


Short Answer Type Questions

21. What Is Evaporation? State one large scale use of the process of evaporation.

Ans: Evaporation is the process by which a substance changes from a liquid state to a gaseous one below the boiling point; in particular, it is the way in which liquid water becomes water vapour and enters the atmosphere. The solvent in the mixture is evaporated during the evaporation process. To obtain common salt from saltwater, extensive evaporation is carried out. Using evaporation, we can also separate sugar dissolved in water.


22. How will you obtain clear water from a sample of muddy water? 

Ans: In a beaker, the murky water is collected. A thread is attached to a large chunk of alum. Then, using a thread to hold it, the piece of alum is lowered into the beaker of murky water and rotated there three or four times and then removed.  Some of the alum dissolves in the water when the piece of alum is rotated in murky water. The dissolved alum particle settles on the muddy water's suspended clay particles. In this method, the heavy alum particles are loaded onto the suspended clay particles. As a result, the clay particles became quite heavy and sits at the bottom of the beaker.


23. Define solubility of a substance. How does the solubility of a substance vary with temperature? 

Ans: The maximum amount of a substance that may dissolve in 100g of water at a specific temperature is known as the solubility of water. The solubility of a substance increases as the temperature rises. The term "saturated solution" refers to a solution containing as much solute as can dissolve at a particular temperature. Due to the presence of intermolecular space between solvent molecules, the solute can dissolve in a solvent in a saturated solution. However, if solute is added continuously, the solvent particles' intermolecular gap is filled and further addition is prevented. As a result, at that temperature, a saturated solution is one in which no additional substance can be dissolved.


24. How is fine sand separated from larger particles? Explain. 

Ans: It is necessary to separate mixtures that solely include particles using sieving, hand picking, threshing, magnetic separation, chromatography, and winnowing. The sedimentation and decantation methods must be used to separate mixtures that comprise both solid and liquid particles. The separation procedure known as sieving is used to separate solid mixtures of varying sizes. So, in order to obtain fine sand, sieving is employed. To obtain fine sand from coarse sand, stones and other bigger particles are removed using a sieve with a huge iron mesh that is positioned at an angle.


25. How will you separate a mixture of mustard seeds and powdered common salt?

Ans: Decantation is similar to sedimentation, but it also requires pouring out the liquid in order to leave the solid behind. By letting the solid settle to the bottom of the container, sedimentation is the process of separating the insoluble solid from the liquid. So in the case of mustard seeds and ordinary salt in powder. Mustard seeds are not soluble in water, while salt and water combine well to generate a transparent salt solution. So, we fill a glass with water first, and then add a mixture of mustard seeds and salt in powder. After thoroughly combining the ingredients, the common salt in powder form will be dissolved, leaving the mustard seeds behind.


26. How is scrap iron separated from a heap of waste materials in factories? 

Ans: Large electromagnets are used in factories to separate the scrap iron from the pile of waste items. Large electromagnets that are mounted on a crane are used to separate the scrap iron from the pile of waste materials. The scraping iron pieces were separated from the pile of waste debris when these powerful electromagnets passed over it.


27. 

  1. A cup of tea is said to be a mixture. Name its various components.

  2. What is the general name of the process by which tea-leaves are separated from prepared tea? 

Ans: 

  1. A cup of tea contains milk, tea leaves, sugar, water, etc and hence is said to be a mixture. Each of these ingredients has a unique characteristic, such as the sweetness that sugar adds or the taste that tea leaves provide.

  2. Filtration is the process by which constituents of a fluid mixture are separated based on their size. Filtration is the method for separating a mixture of chalk powder and water. Filtration is the general name of the process by which tea-leaves are separated from prepared tea.


28. Define the terms (a) sedimentation, and (b) decantation. 

Ans: Decantation is similar to sedimentation, but it also requires pouring out the liquid in order to leave the solid behind. By letting the solid settle to the bottom of the container, sedimentation is the process of separating the insoluble solid from the liquid.


29. Which of the two will dissolve more sugar: cold water or warm water? Why?

Ans: Warm water will dissolve more sugar when compared to cold water because as the temperature rises, solubility also rises. Warm water speeds up the process compared to cold water because of the increased molecular motion and frequency of collisions between the water and sugar molecules. In cold water, the molecular motion is lower, which leads to fewer collisions between the molecules. Thus, decomposition will be gradual.


30. You are given a mixture of iron filings and sulphur powder. How will you separate them from the mixture? 

Ans: To separate the components of such a mixture, magnetic separation is used, in which a magnet is passed over the mixture's surface. When a magnet is moved over the given mixture's surface, the iron fillings, being magnetic, are attracted by the magnet. Sulphur powder, on the other hand, is not magnetic and is not attracted by magnets. Sulphur powder, on the other hand, is left behind since it is not magnetic, and thus the two may be easily separated.


31. Define the terms 

  1. threshing, and 

  2. winnowing.

Ans: 

  1. Threshing is a process used to separate grain from the stem and chaff that is covering a grain. In this procedure, the stems of food grain crops like paddy or wheat are beaten or hit hard on a surface. Both the stem and chaff of a crop plant are delicate materials and break, but grains are hard and are unaffected.

  2. Winnowing is a method of separation that employs wind to extract the grains from the husk. The grains and husk mixture is placed in a basket and let to fall from a height while the basket is continuously shaken. The grains are heavy and fall vertically to the ground during this process. The husk, on the other hand, is lighter and is carried far by the wind.

32. 

  1. State one use of the method of winnowing. 

  2. Give one use of the 'hand-picking' method of separating mixtures in daily life.

Ans: 

  1. Due to the fact that food grains are often heavier and husk is lighter, farmers employed this approach to separate various types of food grains like wheat, rice, or corn from straw or husk.

  2. Hand picking is the most common method for separating various substances in our daily lives. We frequently find some stones in wheat, rice, and pulses. This approach is simple and requires no machinery or equipment for separation. Hand picking is used to remove the stones from grains like rice, wheat, or lentils in order to use only the pure grains.


33. How will you separate a mixture of common salt, sand and iron filings? 

Ans: Magnetic separation is used to separate the iron fillings from the provided mixture. Iron fillings are magnetic and are drawn to magnets. Iron filling sticks to a magnet when it is moved over the surface of the provided combination, leaving salt and sand mixture behind. Filtration is employed to separate salt and sand from the mixture. Sand is insoluble thus the mixture of sand and salt must first be dissolved in water before being filtered through a screen. The evaporation process is used to extract salt from its water-based solution. The solution is heated to the point where salt crystals are left behind and water evaporates as steam.


34. Name the method which can be used to separate: 

  1. sand and water from their mixture. 

  2. iron nails from saw-dust.

Ans: 

  1. Decantation can be used to separate the sand and water from their mixture. The sand in this mixture sinks to the bottom of the beaker. As a result, the decantation procedure can separate the water. This method also separates various other non-mixing liquids. Sand will stay as the water is poured into a different vessel.

  2. Magnets can be used to separate iron nails from sawdust. Because sawdust and iron have different physical characteristics. Iron is a magnetic solid or a metal composite that is magnetically sensitive. As a result, it can be quickly drawn in by a magnetic force that is acting on that mixture.


35. How do jewellers separate the pearls of different sizes?

Ans: Jewellers can manually pick or sieve the pearls of various sizes to separate them. Sieving is the process of separating tiny particles from bigger ones using a sieve. In this instance, pearls and jewels are of varying sizes. Jewellers are bigger than pearl. Therefore, sieving makes it simple to separate it. The sieve's hole will allow all of the pearls to flow through, leaving the jewellers behind because of the larger size of the hole that prevents them from passing through.


36. How is the impurity of iron present in several substances removed in industries? 

Ans: An electromagnet is used in industries to eliminate the iron impurity that is present in a number of substances. Because iron and impurities have different physical characteristics. Iron is a magnetic solid or a metal composite that is magnetically sensitive. Therefore, it is easily drawn by an electromagnet. However, the impurity cannot be attracted by an electromagnet. So, employing an electromagnet, the iron impurity that is present in many substances can be eliminated.


Long Answer Type Questions

37. What is a mixture? Give five examples of mixtures. Why do we call sea-water a mixture? 

Ans: A material is referred to as a mixture if it contains two or more distinct substances. Secondly, the components of the combination are physically joined together rather than chemically joining. The mixture may consist of suspensions, solutions, or colloids. 

There are primarily two kinds of the mixture. Mixtures that are homogenous and heterogeneous.

Examples of mixtures include tea, cement, sea, etc.

Seawater is seen as a combination. Considering that seawater is composed of more than just salt and water. When salt is dissolved in water, it is referred to as a solute and the water is referred to as a solvent.


38. Describe how common salt is obtained from sea-water.

Ans: Evaporation is the process by which a substance changes from a liquid state to a gaseous one below the boiling point. In particular, it is the way in which liquid water becomes water vapour and enters the atmosphere. The solvent in the mixture is evaporated during the evaporation process. To obtain common salt from saltwater, extensive evaporation is carried out. Seawater evaporates as water vapour into the atmosphere when it is exposed to sunlight during the evaporation process. Salt will continue to be solid.


39. Why do we need to separate different components of a mixture? Explain with examples.

Ans: Two or more different kinds of substances or components are present in a mixture. Some of the compounds will be useless or hazardous to people as a result. Therefore, these components may have been taken out of the mixture. Taking stone collection from wheat and rice as an example, because stone is an undesirable component of wheat and rice and filtering the liquid to separate the tea leaves from it. Additionally, handpicking, threshing, winnowing, sieving, distillation, sedimentation or filtration, and separating funnels are some of the common techniques used to separate components or mixtures.


40. Name a solid, a liquid and a gaseous mixture. How will you separate a mixture of sugar and sand?

Ans: A solid mixture made up of two or more other solids. Consider the word alloy. A metal called an alloy is composed of two or more metallic components.

A liquid mixture is any solution that includes two or more other liquids; water and alcohol are an example. Water and alcohol are the only two ingredients in it.

A gaseous combination made up of two or more elements. For instance, air. Various gaseous substances, such as oxygen, carbon dioxide, etc., are present in the air.

The dissolving of sugar in water can separate the sugar and sand mixture. When sugar is dissolved in water, the sand will remain suspended at the bottom (sedimentation), the solution can be collected and heated so that the water is evaporated leaving the sugar crystals behind. 


41. 

  1. What is a saturated solution? Explain with an example. 

  2. What will happen if the saturated solution of a substance in water is 

  1. heated, and 

  2. cooled? 

Ans: 

  1. A solution is a uniform mixing of at least two components. The solute and the solvent are the two main divisions of the components found in the final solution. Unsaturated solution and saturated solution are the two main divisions of the solution. The term "saturated solution" refers to a solution containing as much solute as can dissolve at a particular temperature. Due to the presence of intermolecular space between solvent molecules, the solute can dissolve in a solvent in a saturated solution. However, if solute is added continuously, the solvent particles' intermolecular gap is filled and further addition is prevented. As a result, at that temperature, a saturated solution is one in which no additional substance can be dissolved.


  1. The solubility of the solute may rise as a result of heating saturated solution, causing saturated solution to become unsaturated.

  2. By making the solute less soluble, cooling saturated solutions causes precipitate to develop as solid crystals.


Multiple Choice Questions (MCQs) 

42. A mixture of tea-leaves and iron filings can be separated by: 

  1. filtration 

  2. hand-picking    

  3. magnet   

  4. sieving 

Ans: (c) magnet

Filtration, hand-picking and sieving methods cannot be used to separate the mixture containing iron filings and tea-leaves.


43. A solid is dissolved in water. Which one of the following methods can be used to separate it? 

  1. filtration 

  2. evaporation 

  3. sublimation 

  4. decantation 

Ans: (b) evaporation

To remove a dissolved solid from a liquid, evaporation is a procedure that can be utilized.


44. Which one of the following methods can be used to separate copper sulphate solution into copper sulphate and water? 

  1. loading 

  2. filtration 

  3. decantation 

  4. distillation 

Ans: (d) distillation

Distillation is the heating of a solution of two substances to cause the liquid portion of one of the substances to evaporate. A condenser is used to condense the vapour, which is then collected in liquid form.


45. In cashewnut factories, cashewnuts of different sizes are separated by the process of:

  1. hand-picking 

  2. sieving 

  3. winnowing 

  4. loading 

Ans: (b) sieving

The method used in industries to separate cashewnuts of various sizes is sieving.


46. Which of the following mixtures cannot be separated by using water as solvent followed by filtration and evaporation? 

  1. sand and sugar 

  2. salt and chalk powder 

  3. sand and sulphur 

  4. blue vitriol and sand 

Ans: (c) sand and sulphur

Sand and sulphur are both insoluble in water, therefore neither of them can settle down or become soluble. Sublimation is the transfer of a substance from its solid state directly into its gas state without first going through the liquid state.


47. Common salt is recovered from sea-water by the process of:

  1. filtration 

  2. distillation 

  3. condensation 

  4. evaporation

Ans: (d) evaporation

Evaporation is responsible for recovery of salt(common) from the sea-water.


48. When rice and pulses are washed with water before cooking then the water is separated from them by the process of:

  1. filtration 

  2. decantation 

  3. distillation 

  4. evaporation 

Ans: (b) decantation

Decantation is the process of non-mixing separation of the liquid from the solid and other immiscible liquids by removing the top layer of the solid or liquid.


49. The solubility of a substance in water is 204 g at 20°C. This substance is most likely to be:

  1. common salt 

  2. copper sulphate 

  3. sugar

  4. potassium nitrate 

Ans: (c) sugar

The substance having solubility of 204 g in water is sugar. 


50. At water treatment plants which supply drinking water, the river water is filtered by using:

  1. filter papers 

  2. porcelain filters 

  3. cloth filters 

  4. sand filters 

And: (d) sand filters

Rapid sand filters, fine sand filters, and medium sand filters are the three types of sand filters used in the wastewater treatment process of water purification.


51. Tiny pieces of stones are usually separated from pulses before cooking by the method called:

  1. sieving 

  2. threshing

  3. hand-picking 

  4. winnowing 

Ans: (c) hand-picking

Tiny pieces of stones are usually separated from pulses before cooking by the method called hand-picking.


52. The process of distillation can be used to separate a certain type of mixture into their constituents. This process consists of: 

  1. evaporation followed by filtration 

  2. filtration followed by evaporation 

  3. evaporation followed by condensation

  4. condensation followed by evaporation 

Ans: (c) evaporation followed by condensation

Distillation is the heating of a solution of two substances to cause the liquid portion of one of the substances to evaporate. A condenser is used to condense the vapour, which is then collected in liquid form.


53. One of the following mixtures cannot be separated by the three steps: stirring with water, filtration and evaporation, applied one after the other. This mixture is most likely to be that of:

  1. chalk and sugar 

  2. salt and sand 

  3. sugar and sand

  4. sugar and salt

Ans: (d) sugar and salt

Sugar and salt cannot be separated by the three steps: stirring with water, filtration and evaporation, applied one after the other.


54. Tincture of iodine is a weak solution of iodine in alcohol. Iodine can be recovered from tincture of iodine by the process of:

  1. filtration 

  2. distillation

  3. evaporation 

  4. decantation

Ans: (b) distillation

Distillation is the heating of a solution of two substances to cause the liquid portion of one of the substances to evaporate. A condenser is used to condense the vapour, which is then collected in liquid form.


55. Which one of the following is not a method of separating mixtures?

  1. threshing 

  2. loading 

  3. sewing 

  4. winnowing

Ans: (c) sewing

Threshing, loading, and winnowing come under the techniques which are used for separating mixtures.


Questions Based on High Order Thinking Skills (HOTS)

56. The sample of water collected from a shallow pond has some tiny particles A suspended in it. When a piece of substance B tied to a thread is rotated in this sample of water kept in a beaker, then the suspended particles settle down at the bottom of the beaker quite rapidly. This process is called C. The clear water is then separated from the settled particles by the technique D.

  1. What could the particles A be?

  2. Name the substance B. 

  3. What is the name of process C?

  4. Name the technique D.

Ans: 

  1. Particle A can be mud/clay.

  2. The substance B is Alum.

  3. Loading. In order to fasten the sedimentation process, chemical additives like alum are added to liquid.

  4. The clear water is then separated from the settled particles by the technique Decantation.


57. The mixture of a powdered white solid P and a liquid Q can be separated by filtration. The solid P is left behind on the filter paper but clear liquid Q passes through the filter paper and collects in the beaker kept below.

  1. Name one solid which could be like P.

  2. Name the liquid which Q could be.

  3. What name is given to the solid left on the filter paper?

  4. What name is given to the clear liquid collected in the beaker?

Ans: 

  1. One solid which could be like P is chalk powder.

  2. The liquid which could be Q is water which is a clear liquid.

  3. The name given to the solid left on the filter paper is residue.

Residue is the leftover which is collected during the filtration process. In this case, powdered chalk is the residue.

  1. The name given to the clear liquid collected in the beaker is filtrate.

Filtrate is the solution which is obtained as a result of the filtration process.

The clear water collected in the beaker after filtration is the filtrate.


58. There are four mixtures A, B, C and D. The mixture A contains sand and sugar, mixture B contains chalk powder and salt, mixture C contains salt and sugar, whereas mixture D contains sugar and charcoal powder. Which one of these mixtures cannot be separated by using water as solvent? Why?

Ans: A heterogeneous mixture in water includes sand and sugar, chalk powder and salt, and sugar and charcoal powder. In contrast, when sugar and salt are combined and dissolved in water, a homogenous combination is the result. In light of the fact that both will dissolve in water, they cannot be separated by filtering or evaporation either. 


59. A mixture contains two components W and X . The component W is a white solid which is soluble in water. It is obtained on a large scale from sea-water by the process Y. The component X consists of tiny pieces called filings which can be attracted and removed from the mixture by a device Z.

  1. What do you think is component W?

  2. Name the process Y.

  3. Name the component X.

  4. What could the device Z be?

Ans:

  1. The component W in this case is Salt because salt is a white solid which is easily soluble in water.

  2. The process Y is evaporation because using the evaporation technique we can recover salt from salt solution. Using the same technique salt is collected from sea-water in huge quantities.

  3. The component X is Iron because tiny pieces of Iron are also called as fillings which are magnetic in nature.

  4. The device Z is a magnet which is used to remove the fillings from any mixture. The magnetic property of magnet makes it easy to remove the impurities from the mixture.


60. Component A dissolves in component B to form a liquid mixture. If this mixture is subjected to a process C, then only component A can be recovered. But if this mixture is subjected to another process D, then both the components A and B can be recovered from their mixture.

  1. Name one component which could be like A.

  2. Give one example of a component like B.

  3. Name the process C.

  4. What could process D be?

Ans: 

  1. One component which is like A is Salt since salt easily dissolves in water.

  2. The component B is Water and the resulting solution formed is salty water.

  3. The process C is evaporation because using the evaporation technique we can recover salt from salt solution. Using the same technique salt is collected from sea-water in huge quantities.

  4. The process D is distillation because using distillation we can collect both solute and solvent at the same time. It basically involves evaporation and condensation in a cycle.


Importance of Lakhmir Singh Class 6 Science Chapter 5 Separation of Substances

This chapter holds immense importance in the development of a scientific foundation in the students of Class 6. It explains the different types of matters and how they can be distinguished. Hence, this is a basic chapter that develops concepts related to chemistry and the things we commonly use.


It will explain what pure and impure substances are and how we can determine them. Students will learn about different types of mixtures with explanations and examples. They will also find the features of heterogeneous and homogeneous mixtures. This chapter will then proceed to explain the need of separating the constituents of a mixture.


The concepts of this chapter will also assist students to find out the answers to name two naturally occurring materials and two man made materials. They will learn what natural and manmade substances are.


Students of Class 6 will also learn how to identify transparent, translucent, and opaque materials in this chapter. After learning these topics, they will be able to answer questions like Which of the following is transparent milk iron glass wood?”, What are the properties of materials Class 6 Chapter 5”, etc. They will learn to use these properties to differentiate between various materials and will understand which methods to use for separation. The prime motive of this chapter is to explain Lakhmir Singh Solution. Why do we need to sort materials into groups? Hence, it is a crucial part of the Class 6 Science syllabus.


Benefits of Lakhmir Singh Class 6 Science Chapter 5 Separation of Substances Solutions

  • Finding all answers to the questions of this chapter in one place is ideal for the students to prepare for this chapter. These solutions will assist you to find the right answers to all the exercise questions and make your self-study sessions more productive.

  • Referring to these solutions will help you understand the Lakhmir Singh sorting materials into groups meaning in Class 6 Chapter 5 and its importance. The concepts will be clearer to you and will help you to formulate the answers to fundamental questions easily.

  • Resolve doubts about this chapter on your own by referring to the Solutions PDF on Vedantu and prepare efficiently for the exams.


Download Class 6 Science Chapter 5 Separation of Substances Solutions PDF

Get the free PDF version of the solutions for this chapter and refer to it to understand how materials are sorted. Learn these solutions to understand the concepts covered in this chapter properly and follow the format of the answers prepared by the experts to develop your answering skills for the exams.

FAQs on Lakhmir Singh Solutions for Class 6 Science Chapter 5 Separation of Substances - PDF

1. Why do we separate substances?

We separate different substances from a mixture to understand the components and make good use of them.

2. What is the principle of separation?

The principles of separation are to retain the original physical and chemical properties of the constituents by using safe methods of separation.

3. What is the use of separation of materials?

We use different methods to separate unwanted substances from a mixture or to obtain useful substances.

4. What is a mixture?

A substance containing one or more components in fixed or variable ratios is called a mixture. For example, the air is a mixture of nitrogen, oxygen, and other gasses.

5. Is a solution a homogeneous mixture?

A solution has a proper ratio of one or more solutes in a solvent evenly distributed throughout the container.